 If you liked
Toaru Kagaku no Railgun
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 ...then you might like
Zettai Karen Children: The Unlimited - Hyoubu Kyousuke
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In essence, both series incorporates characters who has esper powers. They use their powers for various purposes, some for good while others for evil.
Both series' main protagonist are powerful espers who has perfected their powers for their own use.
Both series features a super power like theme but at the same time has some lighthearted backgrounds. The series follows a group of espers and what they do in their every day lives.
Both series has a lot of drama, action, and some comedy.