 If you liked
MÄR
|
 ...then you might like
Ueki no Housoku
|
Both are fantasy Shonen Sunday manga where the protgonist is in a tournament that lasts most of the series.
Both series involve main characters who are thrown into a survival game in order to protect or gain something from the competition.
Both series involve the use of superpowers and characters who delve into the world of the supernatural.
Both series have diverse characters who have their own reasons to participate in the competition.
Both series involve lots of action.