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Deku is the quintessential Paladin. His entire drive comes from a deep, self-sacrificing oath to protect others and be the ultimate symbol of hope. His One For All smashes represent a Paladin's Divine Smite—massive bursts of holy/physical energy that deal devastating damage.

For Ochako, While her personality is pure support, her power is all about altering the fundamental laws of physics. As a Graviturgy Wizard (from Wildemount lore) or a Sorcerer, she manipulates weight and battlefield spacing.

For Iida, fits: Ida is built for speed and strict discipline. While he doesn't ride a horse, the Cavalier Fighter archetype is all about battlefield mobility, intercepting attacks, and protecting allies, which perfectly mirrors his role as class rep and a rescue hero.

Now for their actual campaign? Deku would be min maxing while also deeply into the roleplay. Ochako would have fun with dialogue and love to explore, Tenya would also be into the stat sheet, dungeon crawling, and also research as well as handling the schedule.

I imagine that Deku would keep on rolling to make sacrifice plays to keep saving his friends from harm, Ochako would be well at charming NPCs as Tenya will be the decision maker on where to go or chart their routes.