Isekai have their own built in class systems. You wouldn't need to find weird ways to categorize them. You couldn't ask for more perfect characters to put into the game. Seriously, no offense to guilty gear. I'm getting the game myself. But I know they're are way more people who have seen at least one Isekai then they're are who have played guilty gear. It's basically free money.

Konosuba

Shield Hero

Overlord

Re:Zero

That's just naming the really popular ones right off the bat.

Naofumi is an easy knight. Straight up tank, he could have a shield bash basic attack. S2 for shield prison and puts everyone in a barrier.

I have a bunch of ideas of the Konosuba cast but I'll separate all that.

This game sells itself on waifus and husbandos. Raphtailia and Megumin in the same game bruh? Naofumi??