If we have an Isekaied character, I feel like he should be special- The hero (Not protagonist, hero). If he Isn't, why would people go to all the effort of summoning him? Sure, we could say it was just a waste of time and it didn't work out, but then, it feels
incomplete. Pointless, even. Again, Why go to the effort of introducing him as a summoned character, when you could just make him a hero from the normal world? I don't like pointless things.
In short, Making summoned characters incompetent simply because they aren't the MC of the story leaves a somewhat bad taste in my mouth. Its a very nihilist idea.
As such, I do not think this idea would work if the protagonist in the story out-does the summoned hero. The summoned hero must be special.
So, if we want to make a story in which the summoned hero appears as a side character, possibilities are:
- A "superhero" who saves the day when the protagonist is in mortal danger (Ie, the entire town is about to be destroyed or something and the local residents including mc have held out as long as they could)
- A distant hero who's achivements of killing the demon lord (or whatever he did) caused global changes,
-A comedic relief chuuny character who nobody believes is overpowered but is actually overpowered and does actually save people.
Another possibility would be that there are many people from another world, and the story is more about how a native of that world tries to navigate around all these summoned individuals. for example, a guild receptionist trying to deal with the aftermath of whatever crazy stunt op summoned person pulled.
If he isn't being summoned into the world, then I'm thinking something along the lines of a cultivation story's "3000 realms" or whatever, in which the characters falls into the world due to some battle between mighty beings, and he needs to just try and survive in some way.
But I guess all I really want to say is...
I want to bring in an Isekai character to kill them in a spectacular way.
Unless he's dying to save the world, no. Bad idea. Needs longer in the oven.