YoungNeil

Qifrey fits the physical description (Gojo magician)

Drasna

The protagonist when he saw a giant shadow approaching.

Kishirika and the protagonist coming soon

MC: With every new challenger to challenge the dungeon, it fills me with intense joy.

I find it unlikely, Minato was already a teenager when he was in the second ninja war.

I like that the protagonist is aware of his limits, although it is a bit shameless to judge Rudeus for being a pervert. In the first chapter we saw his lower-perverted side, but leaving that aside I like how the two of them interact, seeing that Roy tries to reform Rudeus in a certain way. But not enough to radically change your personality. I think Roy should make mistakes so he looks more human so to speak. I think I didn't explain myself well, but you can understand what I mean, at least I hope so.

The harem is problematic, I don't hate it but I prefer there to be only one heroine. Also, from my point of view it would be difficult to manage 2 or more girls on their own, after all they are supposed to have feelings, ¿right? Certainly some of them are very forced and contribute almost nothing to the plot, of course with some almost non-existent exceptions that I don't think I can name. Good luck in whatever you have to do and may the force be with you.

If we put aside the red eyes and short hair, I think Jugram would be fine as an MC appearance. Of course, it's just my opinion, but I hope the author takes it into account.