Betta Fish: Can anybody tell me what kind of Koi my boy is?

And also, is it normal for his pelvic fins are so long? When I do my homework I feel like they all look a bit different than mine. He’s my first koi and his colors have popped so much and I feel like those fins have gotten longer. The last photo was right now, the lighting sucks so he’s a bit dark but great shot of those fins. His patterns are alittle hard for me to match with what kind he is. Any help would be great!