Kymble is the Trill ensign of the USS Vortex in the Doctor's holonovel Photons Be Free, a fictional counterpart of Harry Kim who is presented as a hypochondriac in Author, Author.
Ensign Kymble is one of the holographic crew invented by the Doctor for Photons Be Free, the holonovel featured in the seventh-season Voyager episode Author, Author.
The character is modelled on Harry Kim, with Trill spots added along the sides of the face as a token disguise. In the story he serves aboard the USS Vortex and is depicted as a hypochondriac who pesters the overworked Emergency Medical Hologram, one more organic crew member who takes the hologram for granted.
Kim, like the rest of the senior staff, is unimpressed at seeing himself this way. Tom Paris answers by rewriting the programme so that the Doctor meets an insulting version of himself, which helps the Doctor understand why his friends are upset.