I had posted these on the Save City of Heroes facebook page, someone suggested I put them here. I don't know how close the titan powersets and archetypes will be to Heroes, I haven't read the forum yet.

Tank/scrapper defense:
Psionic defense, telepathic fields that make enemies psychologically unable to hit you compelling them to miss, makes them unable to put force into melee attacks effecting damage reduction, use psionic energy to restrict other forms of energy effecting elemental damage reduction, taunting psionic decoys.

Gelatinous body. Attacks splorch through you, not really causing harm and then seal right up. Graphic of slimy holes on your body appearing and fading away when attacked. Some tanks like ice have a power that takes them out of combat while they heal, this one does it by melting into a puddle on the ground. Use same melt animation when defeated. Combination d/r and fast healing. Kinda goofy, but could be fun.

Gadget defense: Kevlar, ablative armor, defensive force fields, adrenalin injection (self heal, damage buff)

Tank/scrapper offence:
Bestial, mauling enemies with your teeth.

Elastic melee. Longer range than most melee because of stretching limbs. Good pair for gelatinous body.

Blaster:
Thrown weapons, surikens, (cone damage) tranq darts,(slowing effect, probably tier 1 or 2) baseball,(blunt damage, stun. Probably tier 1 or 2) molotov cocktail, grenade.
Teleport melee, player camera stays put but character ports to the enemy, punches them and ports back to start. AOEs show him popping all over from one enemy to the next.

Stone blast, flinging rocks at opponents.

Battle drones, plasma beam attacks come from drones flying around him. Attack animations are holding up a tablet and tapping at it. Matching secondary powerset. One drone if you have one or the other, two drones if you have both. I find visualizing this amusing, the character seems so smug just tapping at his tablet while everyone else battles around him.

Controller:
Phantasm control, ghosts swoop around the battle damaging enemies by passing through them, controlling with fear effects.
Insect swarms, fire ants, mosquitoes, wasps, scorpions.

Masterminds:
Self replication, minions are clones of the player with powers based on whatever secondary set you chose

Werewolves, minions appear human when summoned then transform.

Ghosts, pretty self explanatory

Insects, each minion is a swarm of a particular insect type. Matching secondary power based on the insect controller set.

Mafia, suits and tommy guns.

Giant spiders.

Telepath, take the controller's psionic decoys and make them capable of attacking and thus becoming minions.

Mad scientist. Minions are horrifying Frankensteinish monstrosities, some with brain-in-jar heads, or genetically engineered abominations.

Rikti defectors, minions are Rikti who oppose the war, player is a hero who they have chosen to work with. Minions emerge from the same kind of portal the enemy Rikti use. Comes with Rikti Halloween costume power in case the player wants to be a defector themselves. (Edit: Titans probably won't have Rikti, so this is probably out.)

Defenders:
Nanites. Regeneration buffs for allies, force field generators. Kind of a hybrid of empathy and bubblers. Unique revive power- while fallen ally's dead body is being slowly repaired, the nanites remotely conrol his corpse. For a few seconds they are able to stand and fight while still dead and cannot be harmed because they have no hitpoints. After a set amount of time, 15 seconds maybe, they gain 1/3 their hp and a regeneration buff.

I was going to add a pic of some sketches I made for costume part ideas, but I don't see any way to add an image.