Here is how they would do a Xcom anime.
A 16 year old joins the Xcom unit along with the mysterious girl from class. He starts to lose an alien fight and gains super psychic powers after which he has to fight against alien super moves.
The reason I know an Xcom anime would suck is because I know how anime can fail. Their obsession with power clashes and youth will basically seal the anime's fate.
Heck even Gantz is the closest anime to Xcom as possible and even it wallowed in anime stereotypes.
Neonivek, stahp. You're depressing me.
I mean, it'd be okay for the main or one of the important characters to be a psi soldier. In fact, I'd think it'd be mandatory, and that'd be a good thing. Hell, the entire squad could be all white or as far politically correct as can be. I don't care.
Just...please... think of the potential pathos. It could be sad, depressing, and thoughtful. They could delve into the theme of how humanity differs from the aliens. Hell, they could pull an Ender's Game when the aliens are beaten. It could be great.
Although, technically, I still haven't beaten Enemy Unknown.
Mind you I am probably just bitter because I forced my way through an entire anime in three days and in the end the most boring main character ever basically made all the other characters superfluous, the much more interesting characters... and instead of ending with a team fight against the villain, who should have been more powerful then the other characters, or at least been a tight fight... it ended with a "Ohh yeah I need to believe myself" Curb stomp.
Xcom eventually just turns into a game about a single person. Which is already all anime needs as an excuse to make it a boring main character butt kissing contest.
While I agree that "Ohh yeah I need to believe myself" curb stomp can get out of hand sometimes, I think anime like Gurren Lagann did it really well. I do agree that it does get really stupid and ridiculous some or even most of the time, though.
I don't know which XCOM you're playing. I've beaten neither the original XCOM nor the newer one, but whenever I played them, I usually made it a point to beef up a small team as heavily as possible. It wasn't really all that possible to play the game with just a single person because not even the power armor could protect your main character from wayward shots. You still needed rookies to scout, even if you did have a beefy Commander back in tow to tenderize everything. I really don't think that they could do an anime on XCOM with only a single main character and have it remain an anime about XCOM. It wouldn't feel right; it'd be like just stealing the brand.