Do not insert lame illegal positions like more then one king or stuff like that.
Best illegal position
Black to move
It's totally legal.
By the way, if you want to distinguish "crazy" and "strange" from "illegal" then you need to provide a very precise and complete definition. If you can't do that, it is better to simply ask for "interesting illegal positions". Crazy positions are so obviously illegal that they are "uninteresting".

Black to move
It's totally legal.
By the way, if you want to distinguish "crazy" and "strange" from "illegal" then you need to provide a very precise and complete definition. If you can't do that, it is better to simply ask for "interesting illegal positions". Crazy positions are so obviously illegal that they are "uninteresting".
Okay if you say so

it is illegal, rook cant leave the h1 g1 h2 pocket and there arent enough pawns missing to promote to a new rook
Do not make this position crazy or strange, make it ILLEGAL. I-L-L-E-G-A-L.