Unfortunately, won't make TTT, tonight (H.S. soccer season is underway) but the classic "superhero" tank is Inv/SS.  Nigh unkillable and Foot Stomp is just so "superhero-y".  Want to melt the world and still survive?  Fire/Fire/Pyre is my go-to.  You said you didn't want a stoner, but boy they are badass, even without (especially without) Granite armor.  Bio/anything is great and there are so many different benefits (+Res, +Def, mitigation) from various attack choices, you can't go wrong.  Shield/Dark Melee (for the heal) is my most durable Shield tanker, but my Shield/War Mace is right up there and dishes out more mayhem.  Ice/Stone Melee is also an aggro magnet of pulverizing doom.  Roll what fits your concept and you can't go wrong (see sig).