JOSHUA
You get one more skill from Athlete.
Keep in mind you don't have your powers yet. It's fine if you want to leave them on there (it'll save you from updating later), but I'll be using his normal stats until then (meaning he only has 10 hp for the time being, etc.).
Melee attack bonus should be +4 (+1 BAB +3 STR). Super Strength specifically does not add to attack bonus, though it does add to damage.
+1 defense when you wear the leather jacket
FORT save should be +3 (1 for class and 2 for con)
Brawl and Combat Martial Arts:
These feats do not stack. You can either use one or the other. So your attack options would be (reflecting the +4 melee bonus as above):
Brawl +5 1d6+4 non-lethal damage, not armed
Brawl w/ Brass Knuckles +5 1d6+5 lethal damage, not armed
Martial Arts +4 1d4+4 lethal/non-lethal damage, considered armed
Martial Arts gains no benefit from brass knuckles.
All of the above is without the Super Strength. Using that increases the damage of each by +2.
I know the rulebook is not very clear on this (I only know from the errata) so feel free to change one of the feats if you want. I think it's still useful having both, because it leaves you with the choice of doing lethal or non-lethal and also whether you want to open yourself to an AoO or not (martial arts is more defensive, while brawl is more of a reckless offense).