The only "power pool" available is flight. No SJ, TP or anything else. (They really don't need anything else, especially Fitness or Fighting.)
Look at it in the group editor, when you select a mob, if it has more than one skin, there is usually an arrow beside the picture that allows you to scroll through the variants. (This is true on most bosses with multiple looks anyway, not sure about minions.)
Nope. All male. Some folks have done some fun AE missions dealing with female Hellions and such though.
Justice Blues, Tech/Tank, Inv/SS
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Fighting The Future Trilogy
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Just a side note. Force Field has Aid Self for custom critters.
Only one power but still, thought it was worth mentioning
how do I've a custom monster powers from additional sets, such as superjump, Teleport, or Boxing.
How do I know if a mob has alternate skins, I noticed that many Lost Minions have various skins.
Are they any low level female villain NPC?