I got a betta from my local pet store a few days ago, and to be honest it was a bit of a pity purchase. He was the only male who, instead of flaring, would shy away when another betta started displaying at him. Don't worry, I had gone there prepared to buy a betta. Just not such a little wimp. :P
Anyway, I didn't give him a super good look until I had him home and in his tank. His fins are very see-through, with a pearly iridescence when the light hits them. He has a very small (and I mean small) scattering of pearly scales, and blue eyes. That's where his color ends. You can see right through him; guts and arteries and everything. His gills are completely clear, and that's why it took me so long to see that one of his gills is mildly irritated.
Come to think of it, I should have named him Casper. Oh well, Jalen fits fine. :P
Anyhoo, I was wondering if this little guy qualified as a cellophane. If so, that would make him my most unique betta to date; a cellophane AND a delta (a rare find at a pet store).