duh....Clone Commandos!!!!!!!! They're the best EVER!!!! Plus we need some new characters to drool over, i'm not saying Omega and Delta squad are getting old, it's just we need new blood.
ARC's would be cool too. I keep forgetting Rex is not an Arc, he reminds me of one so much, with his Range Finder Helmet, Jaig eyes, pouldron(spell), and Kama.