I do like to name over personality than looks, but man... I can't just keep calling him "that gorgeous tiny fish" every time I talk about him, lol
I did a bit of research for a while and I'm going with a bit of angelic and a bit of medieval. (Excalibur was what my sister thought of, and I liked the idea of medieval, too.)
Rowan is a name that's sticking... but I give my fish middle names now thanks to Revenant, so I think I'm going with Castiel, too.
Rowan Castiel Warner, it is.
Maybe he doesn't look like a Rowan, but as I saw another user say: Name him something simple and let his colors do the talking.
Thanks for the suggestions, guys! (I came pretty close to Carbon or Octavious, lol)
Edit to Comet1993: I saw someone who just got a betta and named them Skyline. I loved the idea of a name having something to do with the sky, but as you've probably read above, I've got his name now. Thanks, though! Cielo sounds pretty neat.