These are tips I suggest you implement in your OC. (OPINIOOOONS o A O)

1. Unique features
     Have you ever sat on the toilet, contemplating life, when all of a sudden an awesome idea about a never-before thought of ability/ image/ personality/ trait for an OC? Write it down. Everyone loves ideas made with your own brain and not someone else's.

2. Personality
     Think of a great personality for your character. Not something mainstream like, -shy, cutesy, timid, quiet- Not that that's not a good thing. But honestly I liek characters that are bold, daring, funny! Don't be afraid to add weird characteristics that make your OC different from everyone else!

3. Running gags
     If your OC was in an anime, what would be the running gag about them. This isn't essential, but it honestly makes OCs so much better. For example -often mistaken as a girl, even by his friends-. It doesn't have to be a gag either. Just something that stays with your character throughout the story. Like -can't stand the cold- or -allergic to animals-. These kind of things can be used brutally against your character just for the sake of some comical relief. :)

4. Deep backstory
     Make something that really connects your audience with your OC. Like -character was orphaned- or something sad that makes your viewer fall in love with them. (Brook's backstory was the best *crai* ; A ;)

These are tips I suggest you don't have in your OC. (OPINIOOOONS. Honestly. I keep repeating this so you better not mess it up okay? . _ .)

1. *My OC is totally the girlfriend of -hot character/ main character-
     Let me tell you why that's -insert naughty word of your choice here-. Honestly I feel (feel as in OPINION) that your OC shouldn't be super special. If the author wants the character to find love etc. they'll add in their own character. These kind of OCs are the kinds that like to draw attention. (typically)

2. My OC is the long lost sibling of -main character-
     Again. If the author wants to implement a surprise sibling (plot twist) they will add their own character.

3. My OC has -insert power here- that is super rare and unique and makes her wanted by everyone. 
     (Remember these are exaggerations) Again. Attention hog. I don't like that. I understand that tons of fictional characters have supernatural powers. I understand that you want your OC's powers to be unique. But honestly. We can do without the fluff "Ooooh my OC has the strongest power in the whole world and stuff". No . _ .

4. My OC is the most beautiful/ handsome and people right and left fall in love with them. (Sorry I noticed I'm using female
     pronouns a lot). How many times do I have to tell you. No one likes attention hogs okay.

5. My OC has the same power/ ability as -main character/ OP character- 
     OCs are meant to be characters brought to life with your creativity, and yours alone. How do you think the author would feel if they saw your little copy-cat character. (I like use situations like: how would the author feel if they saw your OC. As if your OC was already implemented into the main story)

6. This one has to do with your OC's art. Don't just take an already existing character and re-color it. That doesn't count as an Original Character. It honestly pisses me off, especially since I aim to be a great artist. No artist wants their work plagiarized like that.