Team Lightbringers vs. Team Swordskillers
Raze (MK2), Kurando (SH2), Serge (CC) vs. Agrias, Meliadoul, Beowulf (FFT) - All the FFTers are slower, but they all equip Cham Robes. This completely shuts down Raze and cuts into Serge's offense pretty notably, so the only person who can do anything is Kurando. He won't MT OHKO, so Beo will get a turn and status him out. At which point, Serge goes down to Shellbust + something from Agrias. Watch out, SKILL LESS RAZE
Team Princesses vs. Team Speedrun Special
Princess Toadstool, Nina2, Clarissa vs. Jeremy (WA4), Tidus (FFX), Jet (WA3) - People maybe underestimating how fast Hasted Jeremy is. He has a base of 171% average or something, so after Haste, he's like ~340%. Clarissa is like 124% and Toadstool is like 112% (average after first turn). This means, Jeremy actually Triple turns Toadstool. With 6 attacks on Clarissa, she will certainly die. She probably won't make it past the first two attacks. At which point, Jeremy swarms Toadstool and Nina won't solo. Oh, Jet exists too to poke and add some damage or go for Gatling Burst. But yeah, 2 on the other side will die and Tidus can solo after the burst damage anyway.
Team Clones vs. Team Perfect
Chaz (PS4), Claude (SO2), Cress (ToP) vs. Wakka (FFX), Wugui (SH), Alfina (G3) - Chaz outspeeding Wakka and OHKOing him I think makes this easy. Team Perfect is down a person, and Claude will certainly wreck Wugui.
Team Gags vs Team Boss Rush
Decus (SO2), Precis (SO2), Chu-chu (XG) vs. Lassic, Marcello, Jenova - Uh...Marcello might solo everyone on his own, let alone when he has 2 other buddies for support.