Here is an example pair of character sheets, one for the hero, and one for the "Normal Identity" Alter Ego.
Please note, I also have dump statted some stats, and bought up others, another pet peeve of yours, and yet, they all make in game rational sense. I'll explain.
http://www.myth-weavers.com/sheets/view.php?id=32801
This is the "Cat" version of our hero. She's actually a housecat, not a human, and Loki turned her into a catgirl with an alternate human form as a prank, then promptly forgot about her and did some other mischief. She's no smarter than a regular cat, nor any wiser, so her int and wis are 6. She's got the proportional strength of a wet noodle, so her str is 8. She has a 30 dex, because she's a cat, she doesnt fail reflex saves(And even has Immunity: Fall damage), she's sneaky, she's tumbly, balancey, and acrobaticky. So, dex 30. Also, dex affects init, so she's fast and goes first a lot. Lastly, she's got a charisma of 16 cuz she's cute, and lovable. And because she has Distract and Fascinate, and they work of Charisma. All that work totals up to 16 points spent in abilities, which are mostly a throwaway, but they sure help define the character, no?
The powers and such are self explanatory, but briefly, she has claws(strike power, negating her strength, doesnt matter how strong, if your claws slice through flesh like a knife through butter), superspeed(only 2, but still, she's fast), pheromones(even more kitteny cuteness!) supersenses, regeneration, and a prehensile tail.
http://www.myth-weavers.com/sheets/view.php?id=32800
This is sheet 2, her alternate identity.
In this identity, which is a drawback, she's a normal human girl(Yes, even though she's really a housecat. Damn that Loki!) who is pretty smart, int 12, still not very wise, wis 8, still fairly dexy, but not superhuman anymore, at 16, has a str of 6, much worse even than the cat forms, and a cha of 18, pretty pleasant and nice.
She has no superpowers in this form at all, and her attack and defense are both low. She goes from 36 feats to 4, and is basically a normal person. She'll certainly get shredded by the PL 10 foes the group will be facing if caught in this form.
I often make characters with a stat array of 10, 10, 10, 10, 10, 10 because its how many comic characters are. A normal guy with (insert monstrous energy blast/wings/guns/etc). I think its a feature, not a bug.