Oh, School Rumble? Nice. Well here's a few: Inu x Boku, Secret Service, Say 'I Love You', My Little Monster, Lovely Complex, My Ordinary Life/Nichijou, Lucky Star, Acchi Kocchi, Senyu, Karin Chibi Vampire, Kamisama Hajimemashita,Usagi Drop, Anohana, Ano Natsu de Matteru, Ouran Highschool Host Club, Kids on the Slope, GJ club, Angel Beats, YUYUSHIKI, My Teen Romantic Comedy SNAFU (yeah I know it sounds cheesy) , Sakurasou no Pet na Kanojo, Kimi Ni Todoke, Toradora, World Only God Knows, Tsuritama, SKET Dance (reminds me of School Rumble). Okay, I'll stop there, I may have gone a bit overboard..
Ouran High School Host Club
Ah! My Goddess
Baka and Test
Rosario + Vampire
Tsukuyomi: Moon Phase
Powerpuff Girls Z
My Bride is a Mermaid
B Gata H Kei: Yamada's First Time
Based on "Inuyasha" I suggest:
*Kyou Kara Maou.
*Blood Reign: Curse of the Youma.
Based on "Sailor Moon" I recommend:
*Magic Knight Rayearth.
*Magical Girl Pretty Sammy.
*Hime-chan's Ribbon. (Same studio).
*Goldfish Warning. (Same studio).
*Codename wa Sailor V.
*Fushigiboshi no Futagohime.
*Magical Princess Minky Momo. (There's a 1982 series & a 1991 series).
*Creamy Mami. (Had a lot of influence on Sailor Moon).
*Magical Fairy Persia.
*Mahou no Star Magical Emi. (Had a lot of influence on Sailor Moon).
*Devil Hunter Youko (has lots of nudity though).
*Nurse Witch Komugi-Chan.
*Majical Idol Pastel Yuumi.
*Puella Magi Madoka Magica. (Refreshingly violent for a magical girls series).
*Project A-Ko (It's ecchi, but it's girl power).
If you want to relive the Kagome-Inuyasha relationship, there's the entire "Full Metal Panic" franchise.
Fun fact: Sesshoumaru bears a striking resemblance to Youko Kurama from Yu Yu Hakusho, which was a series created by the husband of the woman whom created Sailor Moon.