Anyone from Dragonball Z (even Krillin would be a beast with his kienzan).
Most Section 9 Cyborgs (or military ones) - Ghost in the Shell.
Possibly because the cyborg bodies would be a lot tougher than humans and for them, provided their brain isn't destroyed, they can be easily rebuilt. Plus they have tachikomas and powered armours for when they want to get serious. But they also tend to focus more on guns than blades, which means taking down a titan might be tougher for them too (since gunfire doesn't really stop a titan... unless they hit the exact perfect spot). But when you can rip a tank apart with your bare hands... maybe that doesn't matter as much. (Especially if they provide the swords.)
Edward Elric - FMA (pre-ending of course)
He could easily fight using Alchemy. Cause the earth itself to change shapes and swallow up titans, leaving them vulnerable to his blades.
Most Bleach characters.
Virtually all of them have blades... And they're incredibly fast/powerful so chopping titans down would be easy for them.
Luffy - One Piece
I don't know if he could kill a titan on his own (without being provided a sword)... but his rubbery body and stretching powers would mean they couldn't easily eat him and keep him down. So at the very least he'd survive.
Alucard - Hellsing
He'd probably let them eat him first just to get close. But then he'd unleash his power and destroy them. And then probably eat them for good measure.
Ichika - Infinite Stratos
As long as he can recharge his armour... he could easily kill them. His blade could likely cut through them like butter. But he'd have to be really careful not to take on too many at once and
use up all his energy (since the longer he uses that blade, the less energy he has.)
Houki could probably fight too, but most of the others would have problems since they're more projectile than sword based.