Timid on the outside, but creative on the inside, Heartina Rosebud is a talented youthful pooch who likes to draw. She has a sweet nature as well as an adorable sense of humour. However, she shies away from strangers and other things that are difficult to clear. Hearts is immature, peppy and somewhat cheery. She knows all and tells all, caring for whichever she deserves. She's also a bouncy klutz and stuff.

Hearts has two colourations; orange (as her main form and for regular stuff) and pink (as a test subject for multifurry/conjoinment stuff).
The orange version of Hearts has an exclusive hairstyle, which is identical to that of Temmie from the game "Undertale", albeit having different shades of red and brown. She always wears any kind of outfit, such as a kimono dress and/or a Sonic the Hedgehog costume.
The pink version of Hearts, unlike her orange counterpart, does not have a hairstyle or wear clothing. Instead, she can be seen with extra body parts such as heads, tails, limbs, ears, ect. She is also a limbshifter as well.

Hearts can use her magic pencil/paintbrush to bring whichever she draws to life. Anything she draws becomes real, even though they temporarily do so for 24 hours or until they disappear into a puff of smoke.