Right now, Charles increases player team attack - but we already have Raina for that. If a friend has him as leader, it increases crit rate, but again, we already have sakura for that. Given a dodging Sara is all the rage, doesn't that suggest the dodge stat may be overpowered?
Suggestion is simple. Change Charles stat boost to hit. I say this with my own Charles barely blessed up and my archnemesis having a doped up Charles in his main team.
Also, shouldn't it be that an archer would improve a team's accuracy?? :p