the ocelot is named Rosette (commonly shortened to "Rose") and the pink flower's named is Petal, and they're basically a plant deity that can turn into a cute flower. (i have a drawing of the deity form, but i'm not posting it because i feel like it's a bit too creepy for Scratch) oh yeah Flowey's there as well on the third slide, but he doesn't exist in the lore at all. i just did a little "who are you?" "I'm you but stronger" drawing for funsies.
i tried out a new artstyle where the outer lines are thicker than the inner lines, but i don't think i'll use it again because it looks a bit AI-y. maybe the "Stroke" filter on IbisPaint isn't the best way to do this effect.