A few small things;
If an OC;
~They can't "hate" the southside but once finding out Jug is poor it's all "Oh no whaat southiside is good go serpents!"
~Have some beef, not everyone loves rich Veronica, perfect Betty, emo Jug, popular Archie. They can dislike people.
~Age! I know Riverdale is really bad about knowing high schoolers ages but a sophomore isn't 17! They are either 14 to 15 or 15-16 have accurate information when making ages.
~They do NOT forgive Nick St. Clair
~Do NOT defend Chuck Clayton in season 1
~They are aloud to have big reactions (duh) but don't make them cry or always flip their shit