Marvel:
Quasar (he's got Green Lantern's power set and he is the Guardian of the Universe or some such nonsense)
Moondragon (she's a powerful enough telepath to control an entire planet of aliens while making Thor her love slave; she is one of the best martial artists in the Marvel U; she's a scientific genius; she can turn into a fukking dragon; she's bisexual; and a bit of a c*nt to everyone...she needs to be in one of those 8 million Avengers books ASAP!)
DC:
Wildfire (I have always thought the design that Dave Cockrum came up with for this character was cool and it was seeing him on the cover of a Legion of Superheroes book as a kid that got me started with reading comics; plus his powers are awesome)
Blue Beetle (the OG Ted Kord version is my favorite and always will be...he was like a cross between Batman and Spider-Man)