Cos-Play Heor p205, p306: Maskstaschen's Secret

The wall made of talking robots were inspired by a snippet of the 1983 animated film "Unico and the Island of Magic," in which the villain uses a magic flute to turn people into creepy blocky dolls and forces them to stack together like living Lego bricks to form his castle.  (I saw this unsettling scene while channel surfing as a child without any context of what the holy heck was happening, and didn't even figure out what movie I was watching until almost thirty years later. It haunted me.)
The tank full of sinister orange fluid was from an entirely different anime film, but I'll let you figure that one out for yourself.

Cos-Play Hero p304: Creepy Robot Death Catacombs

Cos-Play Hero p303: Friendly Fire

Sorry, this one is kinda lame.

Cos-Play HEro p302: H4X0RED!!!