Yuri is the other frontrunner on the Tales speculation front. He's easily one of the most popular characters among Japanese Tales fans (there's the whole thing about how he was banned from popularity polls because he kept winning them), and Vesperia was in the spotlight recently thanks to the Definitive Edition on modern consoles, including Switch. The Definitive Edition is what finally let me play Vesperia, and it's become one of my personal favorite Tales games.
Unlike Lloyd, Yuri uses a single sword (although he can also be equipped with an axe instead), and he doesn't seem like he'd be as in-your-face as Lloyd.
Here's an Arte exhibition for Yuri from the Definitive Edition, although it's a lot longer than the Lloyd one. Vesperia also has a couple unique mechanics that might be incorporated into Yuri's moveset (such as follow-up attacks or Burst Artes). As for a stage, there's the Fiertia, the ship Yuri and company travel on, as well important dungeons like Zaude, which could be something like the Tower of Salvation for Lloyd.
He was also voiced by Troy Baker in the original Tales of Vesperia (the new lines in the Definitive Edition were done by Grant George), so while I think
Imran's Tweet about Troy Baker in Smash was just him making a joke about how many games Troy's voiced in, a part of me wants that to be a hint for Yuri lol.