Alrighty, for no good reason whatsoever, I'm going to give you tips on how to make a like-able character for any kind of fictional story medium. Why? I dunno, Why not? These are the ways that I find most practical when trying to build up your beautiful, relate-able OC.

First thing's first: take a blank document, sheet of paper, or what have you, and begin. Write down traits, start with the physical. Hair, eyes, build, (cutie mark) pegasus, earth, unicorn, any strange things like scars, marks, or extra extremities. Try not to make your character to physically complex, as the image needs to be painted easily into the readers mind. Just give the basic and more relevant of features.

Next, start with the mannerisms. Things the character says, does, acts like. I don't recommend it, but this is where you might maybe jot down a catchphrase. I would just stick with a word that the character says impulsively. Something that is a part of their speech, like "awesome" or "woah" something simple like that. If they have a nervous tick, or maybe they tap their hoof, this is where you would write these things down.

Next, delve into the characters emotions. This is the most vital part when it comes to making a good character. What does the character want, need, love, hate? What is their drive, what does the character think of others? Jot down the character's opinions on other characters, on different subjects. What is their favorite food? Love interest? Enemy? What is their greatest fear, to name a few. Spend a lot of time delving deeper into the psyche of your OC pony.

You now have a character, and if you followed the steps well, a pretty damn good one. Remember, don't make your character too like-able. Give them flaws, or insecurities. Nopony likes a Mary Sue. Readers will feel more connected if they are shown that the character struggles with something. Now for the next part: Put all these things into context.

Interview them. Yep. Open a word document, and write out an interview between you yourself and your new character. Start by introducing yourself, and allow your character to introduce them self. Ask them how they are going. Come up with questions, and let the character answer. Don't think, just write. Ask any question that comes to mind, and you'll find that the character will answer. Make small talk, treat it like the Daily Show, and your interviewing a guest. It sounds silly, but you'll suddenly realize that the character has become something more. It has gained a sort of personality, and sometimes you won't be in control. That's how it should be. The character will suddenly be doing things without your permission. Also, don't write any actions. Only speak. This isn't a time to start showing your ponies actions, only they're words.

Now is the part for action. Send the character to school. But wait, Chrome, my character is a forty-two year old man who lives at the bottom of the ocean. Too bad, send them to a middle school, cause that's the funniest. Write the story in 3rd person omnipotent (from a narrative point of view, with insights into every characters thoughts and actions beyond the main character's sights). Write about the character's day, who they decide to hang out with, the crowd they conform to. Write about that test they didn't study for, or that bully that took their lunch money. I'm not gonna tell you how to do it, go ahead and write whatever you feel like to give the story character. Put emphasis on actions, what is happening in the physical world, and remember, show, don't tell.

Now for the fun part. Write it again. This time, from the point of view of the character. Put emphasis on what the character is thinking, or how they feel about the situations they find themselves in. Any feelings or sensations from any of the events should be told in this part. You will suddenly find that you ARE the character, and you will be writing things the way they would write them, the way they would say it. Put a little bit more focus on speech than in the previous rendition.

Not all this is truly necessary, but I can't think of any better way of making the perfect character. Try it out, and see for yourself. This is what is most helpful to me, but may not work for you. Just giving some helpful advice from your friendly neighborhood Chromy.