Hmm.. let's see. I'm actually gonna think this out.
Raine Heartfall - Dark/Dark Controller. This I would keep, absolutely. I've rerolled her enough and finally found the right combinations for her concept. I put something like fifteen billion inf into her build. I had no idea it'd all mean nothing a short few months later.
Hellgirl - Fire/MM Blaster. I think I'd have to keep this too, because they're both part of her concept. Maybe I'd make a mind/fire dominator instead, though.
Lightsparrow - Titan Weapons/WP Scrapper. Another character I rerolled several times. I think I'd keep this too, it was a blast to level.
Aeka - DB/Invuln Scrapper. This one I think I'd actually redo. Something with Bio Armor as secondary. Maybe DB/Bio or Martial Arts/Bio. Or maybe Savage Melee when it released!
Zaxa - SJ/Nin Stalker. I'd keep this one. It's just too damn fun, I'd look forward to the opportunity to level her again just like she was.
Kinzie Rose - Fire/Fire Brute. I'd reroll this. I don't know what to, though. The only reason I never rerolled her before is because she was my badging character since 2007 (Though the ooc character itself had been renamed and given a new concept. She began as Lilith Perfidus. Wonder where I got my name from.) And as a side note, at shutdown, I had 1297 badges.
Snowbelle - Ice/Earth Dominator. I would change this. Ice doesn't hold up anymore as a control set. Maybe Ice/Ice Corruptor. Could be fun!
Heavenly Sun - TA/A Defender. This one breaks my heart. I literally just finished incarnating her a week before the announcement. I think I'd return to her original build though. Archery/Energy Blaster. Super archer!
Auriana - Super Strength/Shield Brute. I think I'd keep this one too, it's so satisfying!
Honestly, my biggest worry for any CoH return, is wondering if I'd be able to get all the names I had back. Not that I had good ones, but they were mine. This reminds me too, though. About this time in 2009, I asked the original owner of Snowbelle if he could give me the name, if he wasn't using it. The day before Christmas, he sent me a message that he'd released it to me because he was overtaken with the holiday spirit. I was so overjoyed I emailed him a billion inf for his trouble.