The mercenary (base class)

[Godskook]

This is too much for one class. Mercenary is way to broad to fit under one class, as they are just ''working for money''.

I actually like the class' design enough to consider modifying it weakly and using in my own games.

And it's a bit hard to justify a ''mercenary'' say ''being immune to mind effects'' when even 20th level characters of most classes don't get such an ability.

First, I disagree with you. Second, "most classes don't get X by level 20" is not a particularly good argument for an ability that a notable subset of them do get by level 20.

And Furious Charge really sticks out as a sore thumb. You have a class that is five poor versions of other classes...yet everyone gets the charge feat? A feat that none of them would really want or really get much use out of?

Everyone who's primarily melee will need to Charge at some points. Though that this benefits particular choices more than others does need to be considered.