Hmm, let's see.
7~8 sounds like a good spot for both Kim and Shego, i'd put them at the same power level, with very similar if not identical attack/defense/combat feats and tradeoffs. Shego, being an NPC, would not have the same pp limitations as Kim, so she'd easily be able to buy metal claws and green fire thingy on top of the rest.
Both being martial artists, the martial artist archetype would be a good place to start: attack/dodge shifted and lots of combat feats, perhaps with the gadget belt fitting for a customed adventurer for Kim.
Ron doesn't need to be that much lower than the other two (i'd say 4~5), he just needs a different build mentality:
He would have the feat-set fitting for a sidekick: teamwork would be ideal, inspire too, good focus on evading and dodging, taunting, fascinate, redirect, set-up, perhaps even enhanced trick. He'd definitely have maxed ranks of Luck.
His main job in combat isn't hitting things, it's annoying/distracting foes and setting up the situation for Kim.
The only thing i got to say about Draken is rather poor combat capabilities (occasionally enhanced by a big laser cannon or something), and apparently a very bad wisdom score, which would also make him the ideal target to trick/bluff/taunt, much like in the series.