Happy is a cat from the planet Excede and a machine companion of Rebecca Bluegarden. He is also a member of the Edens Zero's crew.
SpoilerHappy was a cat found by Rebecca when he was young. He instantly became friends with her due to them sharing common life events. He received his name "Happy" from Rebecca for making her happy by becoming her friend. Sometime later, an accident occurred where a drunk driver ran over Happy, which ended up killing him. Thanks to Professor Weisz, he was revived into a machine body and continued his friendship with Rebecca.