Despite fighting him a bunch I always forget the wizrobe exists... you’re right about the rooms being bland, literally remember the floor pedestals more than the boss.
It is unfortunate how many of my favorite mini boss characters, don't really have that engaging of a fight. And Geko, despite not liking him that much, does indeed have fairly novel gameplay with the ice arrows. Looking back through this, it makes me realize just how much botw needed something similar in dungeons to break up the pacing. (And that they clearly could add enemies halfway through, thanks to the champions ballad)
I always thought it was absolutely hilarious and badass when you approach Igos du Ikana while fighting his lackeys, he just simply kicks you away. And let's not forget his catchphrase: "HEY!" lol