Lloyd is the "weakling", although he is much stronger than Anna. However, he has no PSI powers. Instead, he can use items such as bombs and plasma guns. Unfortunately, these rarely prove useful (the weapons are always either one-shot or broken easily). However, you should be glad he's around because he is needed to get through various parts of the game — and he saves your life. He's also a decent attacker, nearly rivaling Ninten towards the end of the game.
Preferred weapon: Air Gun