Dinurs wrote:that Anime Addventure stuff sounds really confusing, well thanks for letting me know what it meant

Ehhh... it is not so bad, though some readers treat it with disdain. Quality can be inconsistent, but there exist good threads and storylines.
It can be a good place for writers to test the waters with their abilities. Typically, episodes (or additions) are short, add on to an existing storyline, and can be commented on. Since they are short, they can be updated fairly quickly. By having options at the end (generally 4-6), you can somewhat steer the story, and either add to them yourself, oir let others do so. If bad enough, a moderator may remove them and state why.
As for reading them, generally, I download all the episodes in a story thread and read them in numerical order. A more common way might be to get to a point you like, then have the site show all the episodes that led up to that point.
Since this is a search thread, I'm not gonig to comment further, or I risk mod intervention.
On topic, I suppose, the following might also apply, as he is not a mutant per se in either of them:
In this, I'm thinking mainly of his interactions with them in the Asuka storyline, as that is a heavy crossover with XMen.
R-MULTI 'Just won't die' by Jeffrey OneShot Wong - [Status=Not Complete] - [Last Dld=05/31/2006]
And in this one, he is merged with a symbiot, but is not a mutant himself.
R-MULTI 'Chaos and Carnage' by Gundraw - [Status=Not Complete] - [Last Dld=01/12/2007]