How tall do you imagine everyone?
I know that one of the characters probably has an official height listed and you can use that to calculate everyone else's heights with their character sheets, but this is animation and their designs are meant to be exaggerated. I'm saying that if they were real people, here is how I think of their heights:
I think Hank is around 5'9 or 5'10, and as of s4 Doc & Jackson made Dean one inch taller than Hank so he would be around 5'10 or 5'11 (depending on whichever Hank is)
Rusty would be around 5'7
Brock's height on his yeti mummy ID says he's 7'0, but he looks closer to Shore Leave's height in scenes they share, so I'm going to guess that the yeti mummy is 7' (maybe he's wearing lifts?) but Brock is around 6'5
Shore Leave would be 6'2
Hatred would be 6'1
Pete would be 6'0
Billy would be 4'0 maybe? I can't really tell with him
Jonas Sr would be 6'4
The Monarch would be 6'4 (not accounting for his crown/heels)
Dr GF would be 5'5 (not accounting for her heels)
21 would be 5'10
24 would be 6'1 or 6'0
Red Death would be 6'6
Feel free to challenge me or add characters with your height guesses