This is a post detailing Tristan's relationships to other characters on the RPG.
addie_blackwood Addie and Tristan are cousins. Their mothers are sisters. Tristan is far different from Addie, as he's completely inept at flirting and most social interactions, and is far from a Gryffindor, but they get along well. He enjoys spending time with her (especially since she's Arisha's best friend).
anna_farley Anna and Tristan have known each other since childhood because they run in the same Pureblood circles. They both don't really care about bloodlines, though. They're pretty close friends.
arisha_ohearn Tristan is completely smitten with Arisha. They're very close friends, considering they're in the same year and house. Tristan is too shy to tell Arisha his feelings (come on, he's a 14-year-old boy). They spend a lot of time together, and he enjoys her company immensely. Tristan likes to bug her about Muggle-things.
lillithchan Being both 'Puffs, and only a year apart, Lillith and Tristan are friends. He enjoys her cooking, and is very impressed by her Quidditch Keeping abilities.
jude_mortel Jude and Tristan have been friends since childhood, travelling in the same Pureblood circles. Ah, Hufflepuff Pureblood life. Tristan spends a lot of time trying to get Jude interested in muggles and Jude would spends a lot of time trying to make him be excited about history. Neither of them is very swayed by the other's arguments.
nick_trift They are friends, probably from Pureblood things and being 4th years. I can't go further than that until Anna reclaims her internet throne after hiatus.
williamfarley Tristan is well-acquainted with William, as their mothers are close from Pureblood gatherings. Tristan idolizes William. His mother once asked William to watch over Tristan while he was at Hogwarts. William doesn't actually do this most of the time, because it would make Tristan rather angry, but there's still a semblance of big brother-little brother chemistry between them.
If you want Tristan to know your character, drop me a comment.