Didn't realize how many I had, but I think these all fit the criteria. Most probably have backstories, but not all, some were just names I thought of and decided I had to make right then and there. All of these are currently on Excelsior.
Dr. Wholittle - Beast/Time Mastermind(he's a tiny time-travelling Veterinarian who talks to animals)
Early Bird - AR/Traps Corruptor(Out for revenge, he's going to catch that Worm!)
Hare Stylist - Katana/SR Scrapper(Defeats villains by giving them a new look and more confidence)
Missing Lincoln - Mace/Ice Brute(devolved by Nemesis, ran amok and accidentally activated a time machine sending him back in time)
Herb Superb - Plant/Dark Controller(Behold the power of... dude... what were we talking about?)
Astrogator - Invulnerable/Energy Melee Tanker(space alligator, forward scout for Battalion)
First National Tank - Invulnerable/SS Tanker(Patriotic tribute to whoever originally came up with the name back on Live)
Top Copper - Electric/Shield Scrapper(Praetorian Loyalist)
Hannah Banana Katana - Katana/Bio Scrapper(Leader of Bananas with Katanas SG)
Electric Booger Lou - Mace/Electric Scrapper(Brother of Carl Brutananadelewski)
Queen of Uranus - Thermal/Dark Defender(Heavy is the head which wears the Crown of Uranus...)
Mane Culprit - Mind/Energy Dominatior(think Lion in a tuxedo)
Kim Cardassian - Thugs/Poison Mastermind
Me So Hornet - Plant/Savage Dominator
Prince of Whales - Mercenary/Thermal Mastermind
6 Hundred Dollar Man - Mace/Willpower Scrapper(Steve Austin's less successful brother)
Shiver Quiver - Ice/TA Corruptor
Cray Crey - EM/Radiation Armor Scrapper
Cuckoo Clockwork - Electric/MM Blaster
Thing Doer - TW/Willpower Scrapper(Doer of things)
Nekoyasha - Claws/SR Scrapper(anime inspired)
Duke of Hurl - SS/Invulnerable Brute
General Eclectic - Mercenary/Storm Mastermind
Fairy Home Companion - Plant/Fire Dominator(accidental Magic origin clockwork from Praetoria)
Arachnose - Bane Soldier(rumored son of Lord Recluse, born with comically long nose)
Sir Tenly-Knot - Plant/TA Controller(Is he Robin Hood? No! he's Sir Tenly-Knot!)
Neato Torpedo - FF/Ice Defender
Charmonica - Symphony/Fire Dominator
Ragnarok and Roll - Fire/Sonic Dominator
Hamster of Puppets - Ninja/FF Mastermind
Devil's Avocado - SJ/Fire Brute(Unholy guacamole)
Pasture Bedtime - Shield/Dark Tanker(Moo)
Elrond Half-Nelson - SJ/Willpower Scrapper(crazy Elf who runs around bullying people by putting them in half-nelsons and making them say "Uncle")
Scentinel - BR/Bio Sentinel(costume looks like a skunk)
Berjerk - TW/Willpower Brute
Zlon Husk - Necromancy/Electric Mastermind
Cheeter - Savage/SR Scrapper(dressed like a cheetah)
Pizza Cake - Fire/Ice Dominator(the unholy union of pizza and cake!)
Bee G - Thugs/Nature Mastermind(Better have my honey...)
Opie Wants Cannoli - Ninja/Willpower Stalker(not a Jedi, I swear...)