All Purpose Cultural Cat Girl Nuku Nuku (1992)

Ryunosuke has an interesting life for a teen-aged boy. His mother runs a weapons company, his father is an incredible inventor that's on the run from his divorced wife. And his companion is schoolgirl/android with the brains of a cat he found on Christmas Eve while being attacked by his mom's crew.

Nuku Nuku was adapted from its manga origins a few times, and this one is the best and shortest of those attempts.