Does not look like an endler but could be a cross looking at the chest colouration and the caudal fin shape.. but I could be wrong. have not kept guppies for over 3 yrs now
It looks like an immature guppy male to me. They sell guppies with twin swords like that in the LFS but they don't sell them quite that young. I don't recall what they call that caudal fin shape.
u have a very nice fish thier i would keep it away from all fin nippers and alike that will be a breeding beauty try and find a nice female to breed it with
ive got a nice blue delta that i could breed it with but ..
im still waiting on my next batch of guppies from my pregnant female since she has stored up spearm from many males.