I feel like Del could be a Deryl clone. We never see his face or even his skin, when he first gets in a fight with deryl he forfeits instantly, he can create shit from his body, and he seems keen on Charlie who's protecting the OG Deryl. The how and why are up in the air of course but it fits.
I wouldn't like for Del to be Deryl, mainly because it doesn't fit in the timeline given as far as I'm aware, unless Deryl lied to us before turning into a monster which would just be really low of him, like, come on man, I thought we were friends, but you even lied after that fight and having remembered the reason why we are supposed to be friends on the first place?
However, I think it is in fact Deryl because of his dialogues (Which COULD just be red herrings, but still), for example:
-When we go on a mission with him for the first time he says that he always wanted to go to R&X and that he has a feeling he was good in school.
-If we refuse to go on that mission with him he says: "I probably have enough saved up for one fight." (Could be his gasoline, but it could also be Deryl's Golden substance, I mean, the Deryl clone we now doesn't have to save up his golden substance, but maybe because Del is still connected to monster Deryl he does?).
-On that mission he mentions how he knows about Mia, and I don't buy that he just heard it from some random people.
-When returning from the mission he specifically mentions how he shudders when thinking about becoming a monster as an excuse for him not taking of the helmet, and when we say he won't he goes: "Yeah.... maybe.".
-He also says: "I hear some of the rougher evolutions can result in temporary memory loss.", and we respond with : "I'd rather that then becoming a monster.", which makes him go: "Yeah, that's for sure..." (Side note, hope we don't lose our memories when we reach 3rd evo).
-When we return to H.E.R.O's base he also says "I guess I shouldn't be surprised that we get along.".
And that's 6 instances of sus behaviour in only one event, of course there's a bit more tho:
-When we find him and Laurie coming back from a mission after having met them the day before they talk about the importance of the helmets to which Laurie says that it's safer to just wear them rather than chance being corrupted, to which Del replies: "....I agree. It's a terrifying thing, the idea that you might lose your mind.".
-When giving us a tour of the base he mentions that Xanthe is his inspitarion, and if I recall correctly Deryl also said a similar thing a while back.
-When we go to the interview with Del and Laurie and the reporters harass us at the entrance he says : "Just pisses me a bunch of random reporters think they can push me around just cause I look like a kid." (Look like instead of am?)
So yeah, if you look at him with him being Deryl's clone in mind the thing he says, his name and his personality in general do fit. And that's why I think he will end up being a clone after all, even though I don't think it makes too much sense from a logical point of view or even timeline wise. Idk, I might be missing something that makes it so him being Deryl makes complete sense, or maybe IT IS all a red herring and WW is gonna take him in a totally different path that makes him a more relevant character in the future of the story.