Oh boy, that's the kinda thing I suck at answering 🥴 but I'll try. I don't have a specific colour in mind I think 🤔 But I can easily picture palettes I often uses/used.

Monochrome colours for one. Which I often assign one colour to a character because I think that would be his vibe (ex: Mob and purple, Reigen and orange, Ritsu and dark blue).

Black and white with one accent colour (especially in traditional format). I think the one pop of colour through a b&w looks very good and I like it.

Muted colours, I can't think of overtly bright colours when I think of my fanwork. I can also picture a lot of my writing with it too somehow 🤔 I dunno how to explain it, but it would be in more muted colours.