If without one trait your character becomes "not terribly interesting", perhaps he needs more traits! :P
I personally think that this would be okay and not a borderline stu at all.

Hello! Welcome to the PPC Posting Board! You seem to be new here, since I don't recognize your username. Or have you changed it recently, or been gone a while? Either way, won't you introduce yourself? People might feel more at ease about giving you feedback if they don't think you're WAY jumping the gun, posting about agents before we even know who you are. {= )

~Neshomeh

Figured I'd add a writing sample, to give anyone reading more of an idea of the kind of things I have in mind.

Unfortunately for Aaron, the Laws of Narrative Comedy had a better sense of canon than the fic itself did. As he activated the MMD, his footing slipped and he turned slightly. Before he had time realize what was happening, he was flipped over, banging his head painfully against the ground, and end up dangling upside down. "What the hell?" he cried, trying to right himself. "That's not supposed to be possible! I specifically remember them saying that's not supposed to be possible!"

Natasha's lips quirked as she tried to suppress a laugh. "It's not possible with the training harnesses. On the other hand, if you manage to wrap the cable around your leg, it's pretty much guaranteed."

Aaron groaned. "Why do I only get the crappy parts of almost being a canon character?" he asked the world at large.

I haven't seen Attack on Titan yet. Fallout 3 is one of those post-apocalyptic FPS that I can't keep straight.

I like the two sets of memories, and I prefer thematic parallels.

My opinion on borderline Sues is that you just have to keep a very close eye on them and keep them from stealing the show. It sounds like you have a lot of material to use as his kryptonite, just be sure to give him balanced luck.