I decided to take a different route.
.
DoraMed III from
Doraemons. Can control his size at will, has various magical powers (over seemingly anything and everything), has a 4th dimensional magic lamp (which all Doraemons have a form of) and can predict the future.
Lynn Minmei from
Macross. She can end interstellar wars with just her voice. She is so powerful that she even made her seiyuu a star
.
The Great Will of the Macrocosm from
Excel Saga. Great Will had the power to rewrite reality on a weekly basis...and often had to due to the hijinks of ACROSS.
Mokona from
Magic Knight Rayearth. A God and creator of the universe.
Luckyman from
Tottemo! Luckyman!. Everything about Luckyman is counter intuitive to this discussion. Ridiculously weak, slow as a snail, and stupid as sin. But, Luckyman has the greatest power of all: Luck. He always rolled a critical hit or had something happen that would defeat any foe. Trully one of the most powerful characters in existence.