Yes,a Once-lur fandom existed and still exists even if it's kinda dead.if you want a deep dive then look up the video"the Once-Lur is father to all creation."

Though that video doesn't focus on the fandom and more about personified drinks I actually got kinda interested in it,how people made original characters and versions of the Once-Lur was actually kinda cool to me.

Even if there was a lot of*clears throat*once-cest.it was a cool idea of having different versions of this character I honestly love and I kinda wanna dip my toes in the once-lur water!