Some heroes have their own special features. For example: 

1."Anti Counterattack" heroes will not receive a counterattack after attacking. 

2."Aerial Movement" heroes are able to move through obstacles and other heroes.  

3."Anti-electricity" is an immunity to lightning, Airy is unaffected by Merlin's Chain Lightning.

P.S. Skills of "male" and "female" heroes are subject to certain weaknesses and advantages when attacked or attacking a specific sex.