Hello, i have one questions about this character.

I Can't Let You Do This Professor X can use Mind Control and is not dealt unavoidable damage from it.

So lets say that i have a 3 avengers theme force in a 400 game,this mean by the new rule that i can use 4 probability controls but i just have 3 characters,then xavier atack with his power and hit character A and B,then character A attack character C and Miss the roll,can i give an action token to charactet B to use the theme team probability control?

As long as he has the theme keyword and does not have two action tokens allready it's perfectly legal.

First of all, because you have only 3 characters you have only 3 uses of TTPC. It's 1 per 100 point of the build total or how many characters you have, which ever is less.

If character B possess the same keyword that your themed team used as its theme keyword, then yes it can use one of your TTPCs while under your Mind Control.

And then give character b a token?
Also character B would still be allowed their free action via mind control as TTPC itself is not an action. (Take it Deathshead!) Yes?

Good question. Would the MC'd figure take the token for TTPC?

Yes. TTPC places an action token and being mind controlled does not change that.