Personally, I like your RP style, though sometimes you could use a spellcheck 
. Still, if I read your post slowly I'll generally get what you're trying to say there.
I think your charcters are well-developed (the ones I've run into in the RPs on the boards at least) and each has a distinct personality that easily comes across.
As for overpowered: no. I think your guys are up there with the rest of us and have just the right amount of power - in their own ways, of course. After all, a certain insane psychologist might be able to lift a skyscraper, but he can't shoot something a mile away like a certain sniper can.
As for suggestions: yeah, definetely spellcheck 
. Other than that, sometimes a few of your sentences tend to smack into one another and it can get hard to distinguish one thought from another.
This way works for me: before I post something in an RP, I'll read it with the mindset of someone who just found the thread and has no idea what's going on. If I make sense to myself, then I can post it. If not, I do some more thinkering.
"If I had Force powers, vacuum or not my cape/clothes/hair would always be blowing in the Dramatic Wind." - Tenzhi
Characters
Yeah, always proofread the post before submitting to make sure it makes sense and people aren't likely to misinterpret things.
I like it, you already said you're bad at spelling so I don't mess with you about that, but other than the spelling ur good
Spelling has been covered, but I will compliment you on the fact that your guys handle things differently. As in, Ryan doesn't just duke it out with people. He tries to get the jump on 'em. Zack is tactical. Psychologist is nuts. I really like your personalities.
I feel liked . I'll try and word on that spealing
Hey, I was just wondering what you guys think of me.
and be honest!
What doyou think of my RP style, is it easy to read
My charaters, are they overpowered, do they have good backgrounds.
and anything else.
I really want you opinoins, and add any suggestoins. So Please give me your thoughts, I'll give you a penny!!!