I love seaponies. Here are some seapony types I made up XD. I spent all day drawing these... and now I'm showing them to you.
From left to right.
1: a normal Seapony.
2: A unicorn seapony. Pretty much the same as regular unicorns. They can use magic.
3: Flyers. Unlike other seaponies their fins are very large, because of this they are the fastest of the seaponies. They can also glide for short distances above the waves.
4: Deep Seaponies. Very shy seaponies who live in the twilight and dark zones of the ocean. Unlike other seaponies they can't breathe air. They tend to stay in the deep and keep to themselves.
5: Princess Oceana. The princess of the Seaponies. Like Celestia rules the day and Luna rules the night, Oceana rules the sea. She is in charge of making the tides rise and fall.
FUN FACT! I drew these while watching Terminator 2 and the first Alien movie.
I have nothing else to say On day I have to sit down and draw a proper picture again.
Hey here's an idea. It's implied in the show that earth ponies have greater physical strength and a stronger connection to nature, so what if normal sea ponies were hardier? For example, perhaps they could survive in salt or fresh water, or could withstand pressures that would be unsurvivable to the others. Just something that occured to me a while ago.
We're talking about a show where ponies make the sun rise, not gravity or orbital rotation. I don't think the Moon's gravity affecting the tides is something I need to worry about XD