I need to do a proper review of the DLC, so...
Without further ado!
Piranha Plant - A super fun surprise character(who is neither a troll nor a joke pick. Troll picks don't exist, and joke characters are a specifically weak character that's intended to be crap tier. Jigglypuff and Pichu were designed that way, but the former was better than intended, till Brawl hilariously enough, and the latter was buffed in Ultimate to no longer be a Joke character at all. Not even a Lethal Joke character)
Joker - First one that I didn't really much know of among the DLC. Still, a really neat addition and I loved the overall boost mechanic he has with Arsena. Costumes are neat too.
Hero - Though I'd have liked Slime more, it's still a great character design. I was pleasantly surprised to see Luminary as the core face(only partially surprised. I was sure it'd be someone more Western known for the face, but I had a feeling alts were a thing too, and there's no way Erdrick would miss that bus).
Banjo & Kazooie - I admit I didn't really care much or want them, but they are a great choice anyway. The only one with no major mechanics overall, but they did a great job with how faithful they are to the moveset. It's only the stage that I don't like much, but to be fair, none of the DLC stages so far did much for me anyway. I get dizzy during it.
Terry - Easily my favorite. I admit I didn't use him constantly in the SNK crossovers/Fatal Fury games, but he's the only one I have any real experience with among them besides PP respectively. Also, great music options. Neat Mii costumes too.
Byleth - A really interesting choice and finally we get the Weapon Triangle. But more importantly, the Whip Sword is really cool. Among the 3H characters, this one I liked the idea of from the speculation here. Keep in mind I don't play a lot of FE, and only actually own the GameCube games along with a demo for... Awakening I think? Regardless, neat choice. It also proves that 1st parties were not off the table.