One of Yugi's classmates and closest friends. He has been with the main group throughout the series, although has only dueled once as himself. He was once briefly possessed by the Big Five to duel Yugi and Joey.
While duelling as himself he uses a mixed deck with monsters displaying weapons or military-themed designs. His ace monster is Super Roboyarou which really doesnt do much and lacks power. Although he does have Sengenjin, which is a much better monster.
Tristan is most likely our last, or second last DM character, depending on whether they will give us one more character or not.
There's just not enough space anymore for the "dots" in the Gate for DM characters, at most it can only contain 2 more "dots". Tristan will occupy one of them since he's not in the Gate yet, so there's only 1 space left. Whether that 1 space will be used or not, we still don't know.
There was a super-ancient "theory" that surmised that there wasn't much space left for more "dots" on the gate that correspond to duelists. Of course, this was quickly proven to be a stupid assumption since they can, you know, just move the dots closer together when they add a new character, which is exactly what they did, and still do.