give me some anime characters that have powerful powers

There are some people in Pandora Hearts with powerful powers such as Gilbert, Alice, Sharon Oz & Most powerful of all break. they all except Oz have very powerful chains, Break has the Mad Hatter who's power is to get rid of all chains.

There are some people in Attack on Titan who have the power to fight such as Levi, Mikasa, Eren, Annie, Jean, Marco & pretty much the rest of the Survey Corps.

Then there is characters with no physical powers.
We have Deathnote's Light Yagomi. Light has the power to kill people by writing down peoples names in his book or Deathnote.

Finally we have Britain from Hetalia. Legend has It that Busby's chair killed all of those who sat in it. Britain try's to haul the chair into the conference room so America can sit in it. But Russia's awesome skills break the chair.
Britain is now upset.

Also for me many characters in Pandora Hearts, like Oz, Break and Glen. They have really powerful chains.

In Kuroshitsuji Sebastian, he's a demon.

In Guilty Crown Shu, he has the "King power" and he can manipulate the voids inside everyone. Is a really cool power.

Ban Mido and Ginji Amano from GetBackers. Ginji has the ability to generate electricity from his body, much like an electric eel. Ban has a 200 kg force grip known as the "Snake Bite" and a power called the Jagan that makes people see "nightmares" that he can control and can last several hours in the victim's imagination, while only one minute in reality.

Many from Naruto. I will mention Madara Uchiha.