I'm looking for this old animated movie (probably '70's - 2000s, judging by what I remember from the animation).
I don't remember the plot, but the main character was a prince who sort of looked like a lion or feline (still walked on two legs; I think he had a tail and red hair) and fell in love with a girl from the outskirts of his kingdom. I believe her people were related to the water somehow and were considered enemies of the main character's kingdom. I think her people also had blue skin, but I might be wrong.
Another character I remember is a snake princess who was engaged to the main character, and she had a maid. The snake princess was part of a strategic alliance by her father (these two are part of another kingdom) to solidify the relationship between the lion kingdom and the snake kingdom (they were probably not called this), but the lion prince had fallen in love with the enemy girl.