Board Thread:Questions and Answers/@comment-112.208.245.31-20191012105220/@comment-68.250.226.78-20200429050815

Personally, I'm hoping he comes back at some point as a surprise. Since the AIs of Underworld were initially made to develop sentient weapons, Kikuoka might have thought keeping him(or at least, his data) would be a smart move, though whether or not he uses Eugeo for their initial plan or something else I can't guess. It's entirely possible he'd be brought back just to mess with Kirito, since most of the stuff that happens in this series tends to go that direction. Even more interesting if Eugeo doesn't remember Kirito or Alice for one reason or another.

To note, Kawahara DID say he considered keeping Eugeo alive in the anime(possibly due to his popularity), but decided not to. So since Eugeo's situation is so... flexible? He could use any excuse to bring him back, even as a bonus chapter/mini-arc. Though if he did, Eugeo would most likely be demoted to background character like the other guys, so as not to conflict with Kirito's ever-growing harem(unfortunately - I'd be all for side-stories about Eugeo and the guys, imagine the shenanigans). Considering it's been stated that there will be an alternate route in Lycoris that will allow him to live, there's a little more hope of him coming back somehow.

All this is just my opinion though, while I have hope that he'll come back I'm not really counting on it. I've resigned myself to just enjoying his appearances in the games. (I should mention I haven't been keeping up with the light novels or caught up with the anime yet, so I don't know what the situation with Underworld is right now or what happened with Rath and their AI plan, so if anything did happen that conflicts with my theory feel free to say so. In fact feel free to spoil everything, save me the trouble lol.)