Raistlin is alone. There are no body else from his canon, and that's probably a blessing.

Zuko might as well be alone sometimes, as all of the Gaang is gone 'cept for very rare appearances by Toph, and the Fire Nation Angels are sporadic at best ('cept for Mai, who is always contactable).

The rest-- I think they all have canon mates... though most of them are very inactive (See: Tyrion Lannister - he has Jon and Sansa, who are rarely posted, due to the snail-speed of canon coming out) if they are there.