My shortest character isn't human, but neither is my tallest character? I guess that's what happens when you work in the fantasy genre lol
The shortest one is this ... thing? He's sort of just a robot I guess. I haven't actually stated his name but his name is The Cedric (TM). He is only a few inches tall but I never thought of the exact number. I always forget to included him as a character but he literally has speaking lines and will show up fairly often in Butter Bee as a whole.

Then for tallest so far it would be Knight Geoffrey, but he's literally a giant. He's somewhere around 7' 6" - 7' 8", but that's actually short his people, but it's because his mother was human.

Also I'm not even 5' 3", you're taller than me @Leyelle lollll I'm literally only 5' 1"