I could have elaborated a bit I suppose.
His blandness is what I find irritating. I just lost the whole crew at the end of CS1. Now who do I have as a replacement? Toval. Mr. Whitebread. Mr. watches grass grow for amusement.
He has almost no personality beyond A. being generally agreeable, B. periodically saying meme-y stuff like "Welp" that doesn't make any sense in context. He's like a black hole of a character, and he's not who I want to be spending time with. Thus I find him irritating.
It's cool everybody, I'll do first aid! Sounds like a good plan to me! OK, let's not overdo it here! Welp, your sister sure loves you Rean! I don't mean to be overly snide. I just don't understand the point of the character. He has no meaningful relationship or interactions with anybody, and no interesting character traits. Why is he even there?
And this is all amplified by the fact that your first three characters in the sequel must be the least interesting and most smarmy characters in the game. It's like a white bread sandwich with two slices of white bread and another slice for the filling.