Introducing my first two OCs! On the left is Artemis the Kobold and on the right is Amon the Demon-Imp. A little info about both:
Artemis's full name is Artemis Cast. His nickname is Artie, which is what Amon usually calls him. Amon's full name is Amonanon, but only Artemis can call him by his full name. Anyone else will suffer a terrible fate if they do so (probably some bad luck which ultimately culminates in some rough sex). He's called Amon by his friends and is Mr. Anon formally.
The two have a few things in common. Both are huge nerds and have similar interests when it comes to entertainment in the like. They are also both bi. They have a strong friends with benefits relationship going on, though they don't plan on taking things further with that (mostly due to Amon screwing anyone interested).
When it comes to differences, both have wildly different personalities. Artemis is very quiet, shy, and keeps to himself. And while he'll get crazy with Amon from time to time, he's usually very quiet about what he does behind closed doors.
Amon, on the other hand, has a very short temper and is easily enraged by the slightest disagreement. Don't like his favorite movie? Gonna critique his latest political post? Got a problem with his promiscuity? Brace for impact because he'll let you know how wrong you are and that you should feel bad for being so wrong. Not to mention that he has no filter. Curses whenever he wants and, over dinner, he'll gladly talk about the time he plowed Lucario's ass while he had Artemis film it all. Oh yeah, he also has this little ability to bring fictional characters in their world and convince them to engage in a night of thrills before erasing their memories and sending them back to where they came from. Doesn't tell anyone how he got this power but Artemis is sure he made some deal somewhere.
Ultimately, the two rely on each other quite a bit. Amon is there to push Artemis out of his comfort zone and Artemis is there to (sometimes literally) keep Amon on a leash and keep him at bay. Neither will admit it but they do appreciate their occasional control over each other.