I've been thinking about getting my hair dyed a fun color. I have dark brown hair and I'm not looking to damage it too much.
purple or blue usually looks good. depends what colours u like best and what tone of colour personally i would got icey blue but thats just me
Have you seen oil slick hair? It's a mix of purples, blues and greens and it's supposed to work really well on darker hair (It turns out like this, but I guess you could vary the amounts of each colour if you wanted a different shade) I think it looks pretty cool! (Personally, I want to die my hair a pastel pink or pastel purplish-gray, but I have bleached/medium toned blonde hair)
Manic Panic has some vivid colors that will stick on your dark hair. Just don't expect it to come out like Halsey or anything but you CAN get a very noticeable color tint if you find the right brand.