something off topic, I just watch Kick Ass

a nicely done Hollywood interpretation of GSG
love the scene where Mindy storming the building in that school uniform and briefcase

Kick-Ass and GSG are two different things.

The Professional is a better interpretation of GsG. In fact, I think Yu admits that is where he got the idea.

I do admitted that Leon was a better example (and Natalie Portman was a better loli back then)

Unless Kick-Ass was a dark, serious, and mellow character drama with little-to-no comedy and certainly no glorified violence, then they are not related in any meaningful way. The Professional would be a much better movie comparison from what little I know of it (an IMDb synopsis).