x2 Sprites, Overview

Some Sburb players don't upgrade their sprites two times right away. Instead, they upgrade them once, leaving a slot open. When the party meets up, another sprite can be used to upgrade their own if they come in contact.
This is the x2 sprite; made from a single sprite upgraded once and another sprite upgraded either one or two times. The two sprites become one, and are owned by both of the players whose sprites were used to make it.
The image above is JaspersX2sprite. One player's dead pet cat (who was buried in a cat tuxedo) was used to upgrade her kernelsprite, fully resurrecting her cat and granting it a sprite's knowledge. The second item was someone else's fully upgraded sprite, made from a plush squid doll and a princess doll.