There was a Batman show in the mid-2000s called "The Batman". This show had the misfortune of coming after the critically acclaimed animated series from the 90s, and had massive shoes to fill. It never really stood a chance. While the show had its moments, it's often just seen as a poor man's TAS. One of the most infamous things about the show were the character redesigns, most of which were fucking ugly. The Joker's design is probably the most well known, just because of how weird it is. However, the Riddler is probably the worst offender, he looks like an anorexic goth. Joker at least had the excuse of being in a very action oriented show, so him being a weird monkey/jester/demon thing at least makes sense, but I have no idea who approved of the Riddler design.