Decka

Decka is Sara's sister, introduced in the season 2 episode "Shared Feelings."

History
Decka was developed by Prof. William Gill as a test to see if there could be a mutual bond between AI. He took his highly popular product, the Sara AI, and created a sister for her named Decka. He studied the bond between the two and the test resulted positive; the results amplified with the emotion chip on both activated. Decka, for a limited time, was available on huge cargo ships with more functions than the ones the Sara AI normally took up. One of these ships was the GPSS Absolution; however, Sara decided she only needed herself to do most of the job and activated TOM to help around the ship instead.

Sara eventually remembers her sister, the Decka AI, and activates her to introduce to TOM. TOM becomes fast friends with Decka, but Decka is worried Sara doesn't care for her, judging by her only recent revival. She is eventually able to see that Sara does care for her, otherwise she wouldn't have remembered her.

Personality
Decka is a more youthful version of Sara, but not as young as TOM. She possesses great bonding skills and cares for her sister very much.

Trivia

 * Decka originated from a deviantART comment where someone misremembered Sara's name.
 * Her name could be a pun on "deck," as in "spaceship deck."