At least LC is capable of regret soup.
She isn't some robot ya know.
I have been invaded a few times. One of the times I was able to beat the invader, but only because I had summoned someone beforehand. My only real use was keeping the guy healed. (I suck
I laid out my sign to help people with that duo boss at londo. I mostly died because the one who summoned me either couldn't or wouldn't heal me, but one of the times I successfully helped someone beat the bosses. Felt pretty good about meself.