Read your comics, just wanted to say my protag, Naota, would gladly find an excuse to die again just so he can see what world he'll isekai to next. Bein' a stick figure is hard!
But that's not a satisfying answer, so I'll humor ya'.
If we're talkin' Naota from his original world, then Dan could kill him with one punch; ALTHOUGH one of Naota's biggest feats is that he has the brain of a Jojo protagonist. His greatest weapon is his environment... that and his harem which he's willing to hide behind should things get heated. And these girls love (or THINK they love) Naota so much that they'll fight like nobody's business. It's almost unnatural (and creepy).
Now what about him as a stick figure? Without spoiling my story, Dan would have an even difficult time laying a finger.
"Naota Nakaoka was just your typical harem hearthrob until his life was cut short. Now he's been reincarnated .... as a stick figure. How will he be able to rebuild his harem in a world where where anime tropes (and faces) don't exist??? Find out in That Stick Figure Isekai!!! Episodes every Friday!"