Imagine your life as an anime: fill the following roles with known characters.

Thanks for asking this. It's really an interesting question. ^_^

Boyfriend/girlfriend - Gintoki Sakata (Gintama).
Reason: I truly believe a loser boyfriend suit me better. That's life........

Nextdoor neighbor – Totoro (My neighbor, Totoro)
Reason: I can save a lot on transportation $$, including airfare. Hehe….

Big brother/sister - Kurosaki Ichigo (Bleach).
Reason: He will go all out to protect his family and friends. Especially, his beloved sisters. <3

Little brother/sister - Akihisa Yoshii (Baka to Test).
Reason: He's so stupid, funny and cute. He's very obedient to his sister, and he's concerned about his sister's strange dressing and behaviour. hehe...

Childhood friend - Uryu Ishida (Bleach).
Reason: He's a very caring and thoughtful, and pays special attention to his friends, especially when they are upset or in trouble. <3

Mom - Nana Sawada - Katekyo Hitman Reborn.
Reason: She cooks extremely delicious food in huge amount and without complain. And she never question Tsuna why he's always in troubles.

Dad - Koiwai (Yotsubato!).
Reason: He's a very cool father. And he never throws his temper when Yotsuba make a mess at home. >.<

Mentor - Yoshida Shouyou (Gintama).
Reason: He's kind and gentle to kids. Not only he took in Gintoki, he teach the children skills and knowledge. Everyone looks up to him, even though he's dead for so long. T_T

Clingy exboyfriend/girlfriend - Ryoga Hibiki (Ranma 1/2).
Reason: He's very devoted and loyal to Akane. And he's so cute after changing into a pig. hehe...

Homeroom Teacher - Reborn (Katekyo Hitman Reborn).
Reason: He's always there when you need him.

Random classmate who likes taking orders from you – Hayato Gokudera (Katekyo Hitman Reborn).
Reason: He never say no to Tsuna’s request and dutiful complete it.

I would like to add the following additional answer to your question.

Pet: Chii (Chii's Sweet Home).
Reason: Recently, I'm addicted to this kitten's funny accent. Omochi-roiiiii....

Yano Motoharu
Oreki Houtarou
Edward Elric
Alphonse Elric
Kirito
Sanae Furukawa
Akio Furukawa
Hoenhiem
Usui Takumi
Izumi Curtis
Chitanda Eru

cool question. i'll imagine myself as a high schooler again then. that's a lot to think about. i'll put in TBDs for some of them so i don't end up waiting forever to post this and then fill them in as i think of them.

girlfriend - Tsubaki from Soul Eater
nextdoor neighbor - Sohara Mitsuki from Heaven's Lost Property
little sister - Elsie from The World Only God Knows
big sister - Izumi Takanashi from Wagnaria
childhood friend - Ukyou Kuonji from Ranma 1/2
mom - Yoriko Yasaka from Nyarko-san: Another Crawling Chaos
dad - Sai Nanohana from Jubei-chan
mentor - TBD
clingy exgirlfriend - Ayeka from Tenchi Muyo
homeroom teacher - Miss Yukari from Azumanga Daioh
Random classmate who likes taking orders from me - Hiroshi Miwa from Demon King Daimao

Boyfriend: Lol, I'd just be forever alone, because I think Italy from Hetalia is adorable but he is waaaay older than me. So I'd just be awkwardly crushing on him. :T
Neighbor: Nano Shinonome
Little sister: Kyon's little sister (though she's not really my little sister, just sort of follows me around)
Childhood friend: Yuuko Aioi
Mom: Don't have one; raised by unicorns.
Dad: See above.
Mentor: Sakamoto-san the cat
Clingy ex- boyfriend: Sasahara-senpai
Homeroom Teacher: Yukari Tanizaki (Yukari-sensei!)
Random Classmate that takes orders from me: Osaka

Boyfriend (and later husband): Giotto~ <3
Nextdoor neighbors: Sanae and Akito Furukawa
Big brother: Edward Elric
Little sister: Liechtenstein
Childhood friend: Kuroko Tetsuya
Mom: Erza Scarlet
Dad: Jellal Fernandez
Mentor: Reborn
Clingy exboyfriend: I can't think of anyone :|
Homeroom Teacher: Death the Kid
Random classmate who likes taking orders from you: Tsunayoshi Sawada

Boyfriend/girlfriend: No one! Maybe crush, Zero Kiryu from Vampire Knight! ._.
Nextdoor neighbor: Anybody from OHSHC! I can go over anytime and have fun! X3
Big brother/sister: Haruhi Suzumiya! It will be so much fun!
Little brother/sister: Konata from Lucky Star! X3
Childhood friend: Oreki Houtarou from Hyouka. Because even if he's lazy, he's intelligent and he'll help me in any problem! :) And also Tamaki Suoh from OHSHC! He's such a good friend! <3
Mom: Haruhi Suzumiya's mom maybe! She's not shown in anime, but she never asks Haruhi about the weird things she do and stuff she brings at house! XD
Dad: Soujirou Izumi, Konata's dad from Lucky Star! He's awesome! XD
Mentor: Kyon/Yuki Nagato from TMoHS. I'll love to learn some fighting from Nagato! ^^
Clingy exboyfriend/girlfriend: Itsuki Koizumi from TMoHS! I dislike him so It will be fun to tease him! XD
Homeroom Teacher: Sawako from K-ON! She's so much fun! XD
Random classmate who likes taking orders from you: Mikuru Asahina from TMoHS!

boyfriend-Gray Fullbuster
neighbour-Megurine Luka
Big Brother-Ikuto Tsukiyomi
Little sister-Wendy Marvel
childhood friend-Hatsune Miku
Mom-Kagamine Rin
Dad-Kagamine Len
Clingy exboyfrined- don't know,sorry
homeroom teacher-Gakupo
random classmate-Happy

Boyfriend/girlfriend - Masaomi Kida ღ
Nextdoor neighbor - Ritsu Tainaka
Big sister - Rukia Kuchiki
Little brother - Near
Childhood friend - Sakura Haruno
Mom - Winry Rockbell
Dad - Tomoya Okazaki
Mentor - Kakashi
Clingy exboyfriend/girlfriend - Black Star
Homeroom Teacher - Shizuka Nekonome
Random classmate who likes taking orders from you - Fuko Ibuki ~

boyfriend - none i dont know i dont like anime boys :D
neighbor - nanami lucia (mermaid melody) - i wont get bored with mermaid as neighbor :D
onee-san - aino minako (sailor moon) - its just i have a good friend that we have a lot of similarities and we joke that she is my big sister and her name is roberta - the name i thought sailor venus had when i was a kid and watched sailor moon for first time and i dont know why i thought that when she even hadnt introduced herself in that episode :D
imouto - tsukino kousagi (sailor moon) - chibiusa is my favourite character from sailor moon and she is a lot like me and i call my little (4 year old) cousin that is like sister to me kousagi too in my secret notes since she is chibiusas imouto
childhood friend - kouyama mitsuki (full moon wo sagashite) - id like to have such a nice cute girl like mitsuki as my childhood friend especially since she has 2 shinigami friends that turns her into a singer full moon
mom - tsukino usagi (sailor moon) - usagi is deffinetelly mother of all anime and i like her i think having mother like usagi wont gonna be boring :D
dad - our dad left me when i was little and i dont know him and i dont wanna know but since sailor moon is mother of all anime father is goku from dbz but since i dont like dbz anymore and i dont want to like again i say he left us and all
mentor - um... i dont know :D
ex - none :D
teacher - yumehara nozomi (yes pretty cure 5) - her dream is to be a teacher and she helped me realize my dream to be anime fansubber so i should thank to her a lot
classmate - mizuno ami (sailor moon) - she is smart and since she takes orders from me i can order her to give her homework to me to write :D

Interesting question! here are my answers:
Girlfriend:Suzumiya Haruhi
Next door Neighbor:Yoshii Akishisa
Little Sister:Kurosaki Yuzu
Big Brother:Kurosaki Ichigo (maybe not older he's 15-17..so)
Childhood Friend:Ed Elric/Kudo Shinichi (hard decision)
Mother:Trisha Elric
Father:Maes Hughes
Clingy ex-Girlfriend:not sure..Gasai Yuno?
Homeroom Teacher:Yukari-Sensei (Azumanga Daioh)
Random Classmate:Hard but I guess..Youhei-kun (Clannad)

Uhm... majority of this is from Case closed...hehehe..

Boyfriend/Girlfriend: Kaito Koruba/ most known as Kaito Kid
Nextdoor Neighbor:Suzuki Sonoko
Big Brother/sister: Heiji and Kazuha
Little Brother/Sister: Conan Edogawa!
Childhood Friend: Ai Haibara
Mom: Eri Kisaki
Dad: Yusako Kudo
Mentor: Ran Mouri (mentor in KARATE!)
Clingy exboyfriend: Inuyasha??
Homeroom teacher: Jodie _____________
Random classmate: Aoko Nakamori!

AAAAAAAAAAAA!!!!!!!!! I CAN'T CHOOSE JUST 1 ANIME BF!!!
THTS Y I HAVE SO MANY OCS!!!
*eye twitch*
RANDOM PICTURE OF MY OC FORINA WITH HER FRIEND HIRI AND HIRI'S CRUSH ICHIJOU, BOTH FROM VK!!!!!!!
my OC is Forina, she's the blond wit red streaks....
Hiri is my cousin's OC, she has black hair...
we all kno what Ichijou looks like....

boyfriend-Ikuto Tsukiyomi
Nextdoor neigbor-Wakana Sakai
Big brother-Ichiho Kurosaki
Little sister-Leila Takashiro
Childhood friend-Nagisa Furukawa
Mom-
Dad-
Mentor-Kirito
Clingy exboyfriend-Inuyasha? owo
Homeroom teacher-Narumi
Random classmate-Kyoko Sakura???
ill

scared to say because the people i have in mind will kill me just by being clinging and around me

boyfriend:iwaki kyosuke(haru wo daiteita)
nextdoor neighbor:sawa nagisa(haru wo daiteita)
big brother:katou youji(haru wo daiteita)
little sister:kisa shouma(fruits basket)
childhood friend:L(death note)
mom:eri aikawa(junjou romantica)
dad: ranka fujioka(ouran highschool host club)
metor:akihiko usami(junjou romantica)
clingy exboyfriend:shinobu takatski(junjou romantica)
homeroom teacher:hiroki kamijou(junjou romantica)
random classmate:tohru honda(fruits basket)

Boyfriend: Itachi Uchiha <3
Nextdoor neighbor: Italy
Big brother: Edward Elric
Little brother: Honey-senpai (Mitsukuni Haninozuka)
Childhood friend: Natsu Dragneel
Mom: Kushina Uzumaki
Dad: ______ (I cant think of one right now)
Mentor: Lelouch Lamperouge
Clingy exboyfriend: Hidan
Homeroom Teacher: L Lawliet
Random classmate who likes taking orders from you: Death The Kid

Boyfriend/girlfriend - Spain from Hetalia!!!
Nextdoor neighbor - Death the Kid from Soul Eater
Big brother/sister - Haruko from FLCL
Little brother/sister - Yui from Angel Beats
Childhood friend - Konata Izumi from Lucky Star
Mom - Sanae from Clannad
Dad - Isshin from Bleach
Mentor - Lelouch from Code Geass
Clingy exboyfriend/girlfriend - Yuno from Mirai Nikki
Homeroom Teacher - Iron Man from Baka and Test
Random classmate who likes taking orders from you -Hayate from Hayate no Gotoku

Boyfriend: Shou Kurusu (UtaPri), I can't resist.
Neighbor: Will of the Abyss (Pandora Hearts), I don't know why.
Big brother: Shiki (Togainu no Chi), He's just very big brotherish.
Little sister: Asuka (Fairy Tail), too cute.
Childhood friend: Maria (Umineko), we have alot in common actually.
Mom: Rinslet Walker (Black Cat), the cool mom.
Dad: Squalo Superbi (KHR!), I can see him being my dad.
Mentor: Komoe-sensei (Toaru Majutsu no Index), I think she's nice.
Clingy exboyfriend: Death the Kid (Soul Eater), I'm apparently symmetrical.
Homeroom teacher: Kakashi Hatake (Naruto), who dares me to take off his mask?
Random classmate who takes orders: Hittachin twins (OHSHC), they're up to something.

Boyfriend/girlfriend- Ichigo (bleach)
His sexy!
Nextdoor neighbor- Haruhi Suzumiya
She's loud and fun. Would be a great neighbor to have.
Big brother/sister- Misaki
She's grown up and responsible
Little brother/sister-Toshiro (bleach) and Yami-chan (to love ru)
Toshiro is so cute and serious! Yami would protect me! She has cool powers! And she's also cute!
Childhood friend- Maka (soul eater)
I like her. She's sweet and bright!
Mom- Erza
She's tough!
Dad- Isshin (bleach) or Maze Hues
Isshin is hilarious!! Maze is a great dad!
Mentor- Azumi (FMA)
She's a strong, powerful female!
Clingy exboyfriend/girlfriend- Kaname Kuran (VK)
I think his hot... And a jerk... That is why his an ex
Homeroom Teacher- Sebastian
He will prepare some very good meals :)
Random classmate who likes taking orders from you- Mikuru Asahina
She's weak and easily ordered around!

Boyfriend:Gray Fullbuster (i love him forever more) (besides i met him in real anyways.)

Nextdoor Neighbor: Natsu Dragneel/Jellal Fernandiez

Big brother: Kazuma (stigma of the wind)
Big Sister: Ayano (stigma of the wind)

Little brother: Len Kagamine
little sister: wendy marvel & Chiyo (azumanga daioh)

Childhood friend:Naruto, Sakura, Sasuke

mom: Whitney (FMA)
dad:Edward Elric (FMA)

Mentor: Sebastian (black butler) (Mon-Wed) Zero (vampire knight) (Thu-Fri)

Clingy exboyfriend/girlfriend : OF COURSE NONE!

Homeroom Teacher: Erza Scarlett

Random classmate who likes taking orders from you:
Lucy heartfillia and Juvia Loxar

Okay those are my answers

Posting my mom and dad Whitney and Edward (sleeping together)

Boyfriend - Edward Elric is my Boyfriend. He's soo hot and sweaty and muscly and short and he's alllllllllllll mine. ~*O*~ SO BACK OFF.
Nextdoor neighbor - Maes Hughes. He's the best Nextdoor neighbor a girl could ever have! He's cute, funny, and an overall great guy to be around!
Big sister - Riza Hawkeye is my awesome Big sister. She can protect my from anyone! I liek love her sooo much. <3
Little brother - Alphonse Elric is my cute Little brother who I love very much. He always knows how to cheer me up when I'm feeling down. He has the best advice anyone could ever give. :3
Childhood friend - Winry Rockbell is the evil Childhood friend I. Never. Wanted. Or needed.
Mom - Izumi Curtis is my Mom. She's pretty tough, so you better not mess with me or she'll f!@#k you up! Srsly.
Dad Alex Armstrong is my Dad. ~*~*~*~*~*~*~ Pretty much self explanatory.
Mentor - Führer Bradley. Oh yes. He's the best mentor you'll ever come across. Trust me! You'll need a mentor like him if you ever hope to reach the top.
Clingy exboyfriend - Jean Havoc is my Clingy exboyfriend. I don't know why I was ever with him in the first place. Eeew! He's clearly got issues!
Homeroom Teacher - Roy Mustang is my sexy Homeroom Teacher. He can make me do just about anything simply by looking at me with that cocky little smirk of his. Oh man, he's so HOT! He's to die for! ~^.^~
Random classmate who likes taking orders from you - Don't be fooled. Envy LOVES to take orders from me! (from everyone to be exact) But I don't know anyone who doesn't love taking orders from me. I'm the nicest person you'll ever meet. ~^_^~

Boyfriend/girlfriend
- Jellal Fernendes
Nextdoor neighbor
- Utau Hoshina
Big brother/sister
- Freed Justine (Because my real brother is kind of like him)
Little brother/sister
- Mio (K-On)
Childhood friend
- Asa (Shuffle!)
Mom
- Saber (Fate/Stay Night)
Dad
- Lelouch (Code Geass)
Mentor
- Yomi (Ga-Rei Zero)
Clingy exboyfriend/girlfriend
- Homura (Puella Magi Madoka Magic)
Homeroom Teacher
- The teacher woman from Persona 4 (Don't remember her name)
Random classmate who likes taking orders from you
- Tohru Honda

Boyfriend: No one
Next door neighbor: Natsu Dragneel
Big sister: Lucy Heartfilia
Little sister: No one
Childhood friend: Lucy Heartfilia
Mom: Layla Heartfilia
Dad: Jude Heartfilia
Mentor: No one
Clingy Ex boyfriend: No one
Homeroom Teacher: No one
Random classmate who likes taking orders from you: No one

Girlfriend:June (from Saint Seiya).
Nextdoor neighbor:Ikki.
Big brother:Aldebaran.
Big sister:Saori.
Childhood friend:Shiryu.
Mom:Yuna.
Dad:Mu.
Mentor:Kiki.
Clingy exgirlfriend:Well,unknown,too.
Homeroom Teacher:Kouga.
Random classmate who likes taking orders from me:Shura.

Boyfriend: Karma Akabane<3 (Ansatsu Kyoushitsu)

Nextdoor neighbor: Kuroko Tetsuya (Kuroko no Basket)

Big brother: Sunakawa Makoto (Ore Monogatari)
Big sister: Mikasa Ackerman (Shingeki no Kyoji)

Childhood friend: Nishinoya Yuu (Haikyuu)

Mom: Undecided

Dad: Kurosaki Isshin (Bleach)

Mentor: Levi (Shingeki no Kyojin)

Clingy exboyfriend: Akashi Seijuro (Kuroko no Basket)

Homeroom Teacher: Koro-sensei (Ansatsu Kyoushitsu)

Random classmate who likes taking orders from you: Takumi Aldini (Shokugeki no Soma)