lmao i kid she doesn't evolve but she DOES have variations!!
The top one is the normal Bubblegum and below are a couple fresh variations, including: fuzzy bubblegum, and dragon bubblegum

i mmmMMIGH T BE USING THE FUZZY BUBBLEGUM FOR SOMETHING,,,,,,,,,,,,,,(of course its not a fursuit don;t be ridiculous im not a furry)

Bubblegum herself is a big kaiju made out of pink slime, probably bubblegum-flavoured slime. I recommend not eating her tho

She displays self-confidence to the point she seems egotistic, but she's not as cocky as she acts. She can be a bit intimidating, but she's actually a very social and outgoing monster who loves to be the center of attention!
She has a very polar personality however, sometimes becoming extremely recluse and depressed. She fluctuates between these two personalities at extremes and she is trying to balance herself. She wants to be fiercely independent, but she needs support when she feels low.