When I make a character/fursona, I tend to base off of things I enjoy, such as my fursona, Likuu, she happens to be my favorite colors, and a mixture of a feline species and a goat, thus why she has goat horns, goat eyes, etc.
Try to think of what you like most, favorite animals, colors, and come up with designs mentally then throw them into a lineart or character creator in-game.
I tend to use preset making when coming up with designs, but also look at real life designs, animals, colors, etc.