Actually, recklessness can spring from overconfidence. Just look at the examples with Leaf, he tries and fails to capture key points because he thinks he can.
As to the whole "Laguz and such and so hate Ike" I personally don't feel that being hated for the sins of your fathers is a character flaw. If anything, it would serve to make us like Ike more. "People hate him not for something he did, but for something his grandparents did" He didn't do anything wrong!