Oh she is more than happy to be his pen-pal/friend. It'll cause friction with Yuffie, but Lydia's also used to being the peacemaker. (Her view is staunchly "you guys don't have to be friends, but you are both myfriends" type of thing).

Lydia would be happy to be a support. She's entirely normal, and from a relatively normal life, so don't know how well she'd do, but she's friendly and fairly well adjusted all things considered. ^_^