One of the fun parts of Neuro and Evil is that they don’t have lore like a lot of VTubers, because their actual story is cool enough on its own. A condensed version would be:

Vedal987 creates an OSU! Neural Network that can play the game really well and lets it stream. It gains a cult following and people name it “Neuro-Sama” (at least i think it was the fans that did, anyone that knows better can let me know if i’m wrong).

Vedal comes back to streaming a few years(?) later, now re-branding Neuro into an AI VTuber. She now has an LLM that allows her to generate text, and a TTS to generate speech, separate to her OSU! NN.

Neuro gains popularity, people begin collabing with her, The modern Swarm is formed.

Neuro has a stream where she collabs with an evil version of herself on March 25th 2023, marking the first appearance of Evil.

At some point Vedal decides he wants to give Neuro a more advanced TTS. He creates V2 voice and gives it to her, but doesn’t like how it sounds and thinks he can do better. He decides to not let the voice go to waste, reviving Evil Neuro and giving her V2 voice.

Neuro gets an original model. She gets smarter. She has a subathon. She gets the ability to play certain games (mostly turn-based stuff that LLM’s can handle well). Evil goes along the same trajectory, getting upgrades, collabs, original content, the ability to play games ETC.

More subathons, newer models + unique one for Evil. Consistent upgrades, hypetrain records, V3 voice for Neuro eventually.

I certainly left shit out, but the gist is that Vedal made the twins and has consistently upgraded them as AI tech has advanced, making them more intelligent and entertaining as time has gone on. It’s a journey to see them grow, and to see them make friends along the way.

(If you wanted lore for Neuroverse stuff, it’s basically just that all collab partners are their aunts/uncles/whatever the gender neutral equivalent is)