Tinkerbell was adopted by Zane Santiago as a gift to the family for Snowflake day. Despite being playful, Tinkerbell is also very agressive and often attacks Zane. She ages up into an adult cat in part 14. In part 16 Lifesimmer changes her traits, due to her being to mean and agressive.
Tinkerbell is aged down into an adult cat in Part 2, and in this part Lifesimmer also adopts Peterpan Santiago so Tinkerbell can have a lover and have kittens.