About dragon riders, maybe if one of your other OCs in it (an au of an au)? Maybe Chicago or Wilbur if they grew up there?
Funnily enough, I have drawn that before! They're in my other sketchbook which is at my girlfriend's house at the moment, so I can't pull them out but I will talk your ears off about my Undertale-ish Dragon Riders AU since you have shown interest in my story. I should note, I still need to come up with Dragon Riders appropriate names for these versions of the characters, but that hasn't happened yet. Just know that in universe, they likely would not have the same names.
Starting with CK (we'll come back around to Chicago, don't worry). A dragonborn/werewolf hybrid is what gets as close to his original design as is possible in Dragon Riders. This then informed the rest of the Dreemurr-Font family. You may think that "Oh, because the Dreemurrs have fur then they'd be the werewolves" and that's where you're wrong. No, in this little UT-ish Dragon Riders AU, Dreemurrs like Toriel and Asgore are dragonborns, with Asriel being a dragonblood (what happens when two dragonborns have a kid, introducing more draconic blood, but the still present human/fae blood present prevents it from making a full dragon.) Sans is the werewolf.
This dragonborn/werewolf Dreemurr-Font family also still has Kris, Frisk, and Sariel, though not Chara or Exriel (Chara does still exist, just not as an adopted child of Toriel and Asgore. ... Or maybe still that. Idk, this is still a work in progress.) Sariel, like CK, is a dragonborn/werewolf hybrid, and Kris and Frisk are still humans. Main difference is their clothing styles and ways they were raised. In this AU, like is likely true in canon Deltarune, Kris was adopted by the Dreemurrs very young. (Because I don't have to worry about the whole, combining the stories of Deltarune and Undertale), so they were raised by dragonborns. Frisk, on the other hand, was raised by werewolves, and likely was part of Sans's pack, meaning they became a part of this family when Sans and Tori got together.
(I'm happy to rant more about the DR Dreemurr-Fonts more later)
Onto Naomi, they're obviously a mermaid. Naomi's always had an inspiration of Nemo from Finding Nemo, so they're a clown fish mermaid. Reason I didn't make then a siren despite sirens having more "fishy" features than mermaids is to keep Naomi's hair. Sirens don't have hair. Well... neither do mermaids technically, they're all just whiskers made to mimic humans. Also sirens are deepwater creatures, where I see Naomi and their family living closer to the surface.
Britni would be what is known as a Faeline. Basically, an anthropomorphic cat, or like tabaxi's from D&D. Not much else to say, her design changes the least out of everyone, mainly just changing her ears slightly. I imagine she might still have some reptilian features and technically be a small part dragonborn as I think more about it. Bratty and all.
Wilbur is an arachne, a sorta giant spider centaur thing. Upper body of a humanoid, lower body of a spider's thorax and abdomen. I've changed the number of limbs that arachne have a few times, but I think eight legs on the spider part plus two humanoid arms on the upper torso makes the most sense. I imagine the Wilbur would have still been adopted by Asgore in this AU.
Now, Chicago is probably one of the most different in this AU. Not necessarily because of his design, but you see... Chicago is an animation. A living puppet. Normally in Dragon Riders, animations aren't... sentient. They're tools. Wooden golems brought to life for often more menial tasks than their larger, clay cousins. Which is where Chicago, or Cipolla as he's known in this AU, is an outlier. A freak of nature and magic. He's not the son of a monster mascot and a star here, he's an experiment. A literal puppet, likely confiscated from the mad scientist wizard who created him by the village guard.
Anyway, when I find the original refs, I'll show them, as well as likely draw my Dragon Riders Junior Secret Squad again. I'm always happy to yap more about Dragon Riders, including this little AU of it if you're interested!