Some random tidbits because I'm going to forget them if I don't post them.
Sugar's Papyrus is called Sap. I briefly considered Honey, but I felt Sap fit better & I'm pretty sure Honey is already in use. I haven't decided what Cinna's Papyrus is called, but I'll figure it out eventually. I also think it's funny that both Sugar & Sap are terms of endearment, or at least I consider them to be, because it was not an intentional decision.
Sugar has fangs because I'm a sucker for characters with fangs in their design. Cinna on the other hand has all sharp teeth. Is there a point to either of these design choices? Not really, I just think they look cool in my mind.
I'll expand on this later, but I'm not using the Underverse multiverse & the characters within it because I'm not caught up on the lore & the mechanics of it. I keep meaning to start watching it again but always put it off. Instead, I'm probably just going to come up with my own version of what I consider the multiverse to be like, & any characters that are not my own will be variants of those characters. I'll also probably be pulling inspiration from fics that I've read, which I'll be sure to credit because oh my stars I've read some amazing fics & want to share them. This includes aspects of things from the fic as long as the creator is chill with it.
I might make a separate post later about what I consider to be the mechanics of the multiverse, but that's for a later time.