Assuming my old characters weren't there anymore, of course, I'd remake (with some changes afforded by hindsight, since these were among my earliest characters, when I didn't know what I was doing):
Thunder Glove (probably make him an Elec/Elec/Energy Brute instead of Elec/Invuln/Energy)
Sgt. Greenstone (probably a Willpower/Stone/Earth Tanker instead of Stone/Stone/Energy)
Dr. Bodog (still Bots/Storm/Mace, might get a different name)
BluePulse (assuming it's I24, I'd probably redo him as a Elec/Martial Blaster instead of Elec/Elec, maybe even redo him completely as a MA/SR/Mu Scrapper)
Mob*Star (still Thugs/Traps, might also get a different name, since it didn't really fit his appearance)
Ms. Stungun (Energy/Energy/Energy Brute; no changes to this one. I really liked her, despite having the "worst" melee set)
Diamond Clarity (Earth/Ice/Leviathan Dominator)
Gravity Hold (Grav/Elec/Mu Dominator)
Dark Eidolon (Staff/Dark Brute)
Cobalt Tarantula (Crab Spider. I made him so early in my CoH career that I didn't yet know there was an actual Tarantula critter type, but he's named after
an actual breed of spider)
Jade Lynx (Low-level Widow, was eventually going to go Night Widow. Also named after
a real spider)
And that's just the RE-creation. I want to give Titan Weapons and Bio Armor a try, as well as Beast Mastery, Plant Control, and, eventually, Wind Control.