Merchandise!

Upon the gift's activation, colorless blurry wisps begin to appear in the vicinity of the target with a steadily-increasing rate. At first, they lazily and laterally rotate around the target - with the rotation's direction being random when it comes to each wisp - but their speeds and sizes grow as more wisps emerge. The wisps turn darker the larger they become.

If the gift is used to replace limbs or organs that are normally visible to observers, upon the gift's successful deactivation all wisps burst into roiling swarms of black, ever-shifting glyphs that quickly convene at the locations of the limbs or organs being replaced and build up inky-black and wispy replacements out of themselves until no more glyphs remain.

If the gift is used to replace limbs or organs that are normally not visible to observers, upon the gift's successful deactivation all wisps coalesce into a single swarm with a red sheen which then flies into the target's body and disappears.

If the gift is used to replace some limbs or organs that are normally visible to observers as well as some limbs or organs that are normally not visible to observers, both finalization behaviors described above happen in direct proportion to how many of each are slated to be replaced. If the gift user is interrupted midway through the process, all existing wisps disappear in unison.

Tubby hugs another to repair their broken body, granting them back what was taken from them. Tubby absorbs the anguish of the individual.

People always keep whining and complaining and crying over their injuries. "My leg!" "I can't feel my hands!" "My fingers, oh God!"
Get a grip! Jeez...
I've been thinking of uh just... I give em the typical assurances, and then I... tell em! Spout out some medical jargon and tell em that it'll heal in just a sec! Looking em in the eye makes them wanna believe me... almost.
And it does! Injuries seem to have never happened in the first place! One moment it was broken, the next... poof! Like magic. Was your arm even broken in the first place? I mean... it seems to work; you can feel your limbs working, you can stretch your fingers normally. It feels fine... but something feels off.
Don't let the doubt fester. Don't lie, yourself. Honesty is the best policy, and it's easier to believe in a lie when you trust what you say to be true. Otherwise, the illusion will shatter.

May focused on her wound, and her bleeding stops. Over the course of a minute the flesh and bone shift and remake themselves, Rebuilding her form.

The targeted scar visually casts colorful shadows (that appear to be superimposed on our reality and actively moving) of itself, which all seem to be different iterations of itself. A lot of these seem fae (feathered, covered in fur, slightly shining or even sparkling, golden) and a lot seem eldritch (covered in oil, tentacular or tendril-like, squamous, covered in eyes, insectoid). As the hour passes the original form starts to show up more and more often, until finally it settles in its original healed form.

The mutant now occasionally lays large, orange-speckled eggs. These Eggs do not hatch nor spoil. If cracked and applied to a chronic injury such as a missing limb, the scar heals completely within the hour. However, any area healed by the egg will forever carry an inhuman appearance as testament to the bizarre method of treatment.

The doctor is a master at surgical transplantation. As long as they have a donor part, they can replace any permanent, lingering battle scars on their patient. Of course, the transplanted part doesn't always match, and the patient must be careful to follow the doctor's aftercare orders, or the replacement will be rejected.