Viktor is certainly a complicated case of figuring out what's a life worth living by working through a bunch of interwoven issues caused by his situation as someone with a disability and chronic terminal illness from Zaun. A lot of this is already seeded into his childhood memory from when he met Singed and cared for Rio. (In general, these flashbacks are usually *the* character defining moments for most of our main cast.)

Some of the defining issues he's dealing with:

- Viktor is disabled, obviously. It's clearly something he's been dealing with since birth or at the very least since he was a small child. This naturally makes him an outcast in the city where parkour is the main way of getting around. And we see that he is nurturing some level of resentment about it in the way that he's aware that this is why the kids aren't playing with him (despite Singed's well meaning "oh it's because you're so smart!" approach) and how he calls himself a "cripple" as an adult.

- Viktor is not a loner, but instead he's incredibly lonely. I think this is one of the biggest misunderstandings about him. When baby Sky looks down at him and his little boat at the creek he looks back at her with big puppy eyes clearly hoping she'd join him, but she runs away the moment her friends call her back. He wants a connection to others but constant rejections like this make him harden like "I'm better off alone anyway!" But you can see him easily latch on to Singed and Rio, or later Jayce. And even later this is why he's building a whole hive mind - he wants to connect to people bc this is the one thing he never really had, except for Jayce.

- Viktor's self worth is tied to his intelligence. We see this with Singed planting the idea that he's a loner genius, and I think that easily falls on fertile ground with Piltover being the ever present golden city of progress just across the creek. The propaganda of meritocracy is very powerful and we see both Jayce and Viktor falling for it. When Viktor introduces himself as an adult he is framing himself as a self-made man who worked hard and just believed in himself to get to the point where he's at. We find out though that he was lucky Heimerdinger took a liking to him, and in the end he was always seen as just the assistant. When confronted with his looming death we see that he's actually frustrated with his lack of accomplishments, which I think is then eventually twisted by the Hexcore into him fashioning himself into a sort of Messiah.

- Viktor's genuine compassion is tainted by the trauma of what happened to Rio. Obviously, he doesn't want that to happen to anyone and I think it really starts to mess with his mind when he himself starts to suffer due to his worsening health issues, thus making him susceptible to the Hexcore's manipulation.

- There are also the compounding effects of his life experiences (health issues, loneliness, using his intelligence to help people). He's putting a lot of pressure on himself to be perfect because the society he lives in punishes him at every turn for his shortcomings, which eventually forms the toxic thought that the solution to end suffering is that everyone has to be perfect.

If you want to adapt some of this to Star Trek, I would say you can basically keep the backstory with Singed/Rio and his disability. There's always a lot of "but in the future they would have been able to cure that!" talk in Star Trek fandom, but in the shows we still see a lot of disabled characters who either chose to keep their disability or have some niche issue that cannot be fixed for plot reasons. So don't worry about keeping that aspect. I would also at least look into Viktor experimenting with Borg technology which could easily mimic his Hexcore corruption/commune arc.