Bio:
-was taken one day when she was running her Tem shop
-was given ability to conjure a vortex from her diaper by pulling the waistband open that can pull in anyone into her diaper where they would be smooshed, wobbled, squeezed and floof pooped on before being diapergulped and digested into massive plump diaper mass
-the bigger her diaper becomes, the more powerful Temmie gets as well as enhancing her other abilities, such as massive diaper butt slam attacks and her diaper brap beam which turned anyone hit by it into plump poofy diaper for her to wear
-able to also diapergulp others by smooshing her beeg poofy butt on them, letting her diaper slowly gulp them as she giggles
-loves spending time with her ragtag siblings having poofy smooshy fun
-enjoys collecting stuff from adventures and sells them at Crownreef Plaza, as she had set up a new Tem shop
-she has a silly bubbly personality being a cute adorable goober who always looks for fun and helps out wherever she can
-mark found on her tail

Story:
As Temmie exited the portal, she managed to land safely in some snow, in a world unknown to her. She wandered around finding the snowscape to be somewhat familiar to her though she cant explain why. She found that she blended in with the locals well as everyone wore beeg poofy diapers, which they saw her as a beeg poof butt goober. Soon she managed to scavenge for some valuable stuff and set up her Tem shop, which she also found familiar but with no explanation to why, sitting comfy in her cardboard box and makeshift stall. One day her luck turned around for the better as one day, she had two customers who she was very happy to see. Alphys and Mew Mew had spotted her running her tem shop and ran over to reunite with her, thankful that Temmie still remembered them as Temmie lept out of her box to give her ragtag siblings a beeg poofy hug. Mew mew and Alphys recounted what the ragtags have been up since they been reunited, always on the look out for other lost ragtags. Temmie in turn recounted what she’s been up since landing in crownreef, with Temmie excited that the other ragtags were in Crownreef too. Afterwards, Mew mew and Alphys brought Temmie home as Temmie wagged her tail excitedly, ready to reunite with her ragtag family.

Ragtag Temmie belongs to me
Temmie belongs to undertale
Art by me