You certainly have a range of big slime boys, and that poor reference human looks pretty bored for being around so many big squishy folk. I'm certain shortly after the picture is taken they can come up with something to entertain them.
And poor Bixby, well I'm certain if he really put his head to it he'd figure out how to bridge that size gap. He just may not be able to sneakthief around as much, but everything has its pros and cons these days.

My poor boy Cecil had to play reference human for the rest of the gang. Looking bored or being the physical manifestation of "Sir, this is a Wendys" is kind of his usual Spiel. I'm sure that despite his best to look cool and aloof the rest of the gang managed to show his softer side.

Well, sometimes you'll have to sacrifice one thing to feel tall for atleast a momentary gain, I'm sure that hosing around sometimes helps briding that size gap so he can maybe catch up to Unshaeper. Green Apple miiiiiiiight take more concentrated effort to take on in size and width.

heh looking tubby slimeys~

Jeez...Apple is huge! Bigger than I thought for sure.

And, your Goobold is the prefect size for sneaking around so that's to be expected. Very good sizes all around.

Apple is a very big lad, a VERY big lad. Most think he is smaller then he actually is.

And yeah Bixby is really just a tiny kobold man, doesn't mean he doesn't like it when he is compared to the bigger lads.