Lizards?

You could get a Rankins dragon, but it would need a larger cage in a matter of months. They're like little beardies.

You could get a house gecko, I hear they are very cool.
Or a day gecko, but I don't know how big the days get, but house geckos are normally (at least I've heard and seen) about 6".
Besides, aren't rankins dragons just like bearded dragons or something?
Actually, aren't they the same thing?
They end up needing custom cages when they are full grown.
A 10 gallon would only work for a bearded dragon for aout 6 months at the most.
Even if it was a hatchling, they grow really fast, my best friend Steven has 1.1.1 beardies.
One of which has coccidia from a previous owner bless it's heart.
Steven is doing his best to get the medicine though.
Actually, he might have gotten the medication today.
Anyway.
African Fat Tail geckos are a whole lot like the leopard geckos, but they areindeed a different species that can be housed comfortably in a 10 gallon it's whole life.
Gargoyle geckos are really cool too, they get 5".
They can be housed in a10 gallon their whole life as well.
Helmeted geckos get about 4" and you could have a pair housed in a 10 gallon if you wanted to.
Viper geckos get 3-5".
And then, there's the smallest gecko I could find.
The desert banded gecko, they get from 2 and 1/2 to 3 and 1/2.
But they are amazingly a lot like Leopard gfeckos, and you said you don't want a leopard gecko.
Indo-Pacific geckos get to 5" though, all the geckos I listed in this post are small enough to comfortably be housed in a 10 gallon tank their whole life.
I would say to get a golden gecko, because theyare the greatest geckos on earth!
But they require at least a 30 gallon tank, though they onlt get 6-8".
Well, good luck.
Bye.

-collin

Well, a beardie doesn't need a custom cage when fully grown. A 40-long will suffice, and a 55 would be just fine. And you're right that a Rankins is a beardie, but it is a smaller species of beardie. Still not something you would put in a 10 gal for sure.