I take inspiration from my favourite media. Outfits, hairstyles, and even colour palettes came from a cartoon or two.
But if that is not working for you, I suggest taking your OC(s) and see if the OC needs to add/change a certain asset. Ex: OC needs a different hair colour.
I also like mixing up certain media to make OC designs. It helped me create designs for the comic I’m currently working on.
In conclusion, media you like can make an impact in OC creation.
Diamondmanpixel76
For that one, honestly, I have no idea. Sometimes I reuse certain parts of my OCs, such as the hair or something, and change those. Outfits, well, I try to make different outfits up, even if they don't seem realistic.