Copyrights are valid worldwide but whether or not you got sued would depend on a lot of things.
Like whether the original artist could afford the lawsuit and if it would be worth their time and money to pursue it versus the benefits they'd get out of it.

I think as long as you're crediting the original writer and just posting it for fun, then you don't have a whole lot to worry about. But if you get a cease and desist order from the original publisher, I'd take it down asap.