I hated the Gemini in Lies of P, and unfortunately he made my gaming experience worse
That being sad, I'm not against companions in games per se. Disco Elysium is an example how properly made companion should look like.
To think about, how I would implement a "perfect Gemini"... Hmm, I would rely on the fact he lost memory, and his questline would be to restore it. As you progress in the game and visit certain locations, he remembers lore events he participated in, and tells you about them (maybe in Stargazer menus, like Melina). In the very end, when you arrive to the island, and see flashbacks with Legendary Stalker, he remembers her persona, and that would be the end of his questline and a teaser for the DLC.
Nightreign, do character remembrance quests. Exploring different characters is fun, currently on Ironeye story, but i probably will stick with someone else. I loved Duchess gameplay, but she's not my best.
Also doing another Silksong walkthrough, trying crests and tools i ignored before—that's challenging and fun. And waiting for the DLC news ofc
"you."