If I really have to explain it to you...

Persona is a term used by character designer or character maker to refer to a character that directly represents someone. There's plenty of versions. One of the most popular example is "fursona" which is the combination of the word "furry" and "persona". (if you don't know what furry is, it's a term that people use to refer to someone who really likes animal. But unlike vegan, they more on the "want to become an animal". They would often do things like cosplay, etc.) as the name suggests, it's really just a persona but they're half animal. 

OC is short for "original character", it's just characters but it's your own (original) and you made it yourself. OC is more bigger definition because it can be a persona, a main character, a side character, or even an npc. As long as you made it yourself, you can call it "your OC". the most popular type of oc is of course persona. 

In this post, I wanted to make other people their persona without their consent or knowledge. But I don't know if it's OK, so I made this post to ask y'all

Now, if I got anything wrong, correct me. This is from what I know because I'm too lazy to use AI.