Princess Bubblecum (Patreon)

In one particular episode Bubblegum was turned into a little kid, but merged with a bunch of candy to become an adult again. Coincidentally also the episode where my favorite character is first introduced (Lemongrab).

I like to think that Bubblegum can combine with candy to give herself ample mass in all the right places. Plus, I bet Marceline likes drinking more than just red.