Telekinesis and Pyrogenesis are my favourites. Pyrogenesis (at least the variant I have in mind) enables a "blaster" type hero, always fun, and the super-cool fire elemental role.
Telekinesis is a good match because it has constructive elements, offsetting the indoor-unfriendly fire powers. It makes you able to use your powers as a direct means to help people, becoming a hero instead of a "mere" supersoldier. It also enables levitation when used on oneself, and combined with specially applies pyrogenesis can turn you into a literal rocket-man.
It's also good for lobbing things about and picking people up, "Dark Jedi style", and slamming them into crap. Or just holding them still, suspended in the air for efficient incineration. That is, of course, the evil route, one that I would steadfastly avoid.
Also, I really want to do that trick where you use your thumb to light people's cigarettes.
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