What other animals in a lizard cage?

Do not! I repeat: do not mix leopaard geckos with Any Other species of lizard! They will fight till death of one, the other, or even both! If only one dies, the other will undoubtably be seriously injured! Plus, different species of lizards need a different requirements, leopard geckos are desert types, so you should not pot a Chinese water dragon with it.
I have seen pet stores keep young panther geckos with young leopard geckos. but as they grow older they will fight and even kill eachother. If you want to put two or more geckos together you should only put females together (if you put a male with females it is very likely that they will lay eggs). NEVER put two males together.