Cos-Play Hero p222: Some people have rigged the enemy base with explosives. Maskstaschen has.

Umm... This sabotage is a bit less subtle than he had earlier implied.
Don't try this at home, kids! The Professor is a trained professional.

Cos-Play Hero p320,321: New Target

How is this looking? I'm not sure what I'm doing with these colors.

Cos-Play Hero p319: Remorse?

Cos-Play Hero p317, 318: Shadow Boxing

Umm... This is weirder than I thought it would be. What am I trying to say with this? I'm not sure I... huh. I should probably go lie down now.

Cos-Play Hero p315, 316: Spectral Cyborg

Oooookaaaayyy... I think I may have made this "internal struggle against one's self" trope a liiiiiiiiiittle bit too obvious.

Cos-Play Hero p314: Infighting

Cos-Play Hero p213: Wheres the Reset Button!?

Cos-Play Hero p312: Negative Visual

Cos-Play Hero p311: WOOOOOOP!

Cos-Play Hero p310: Doing Our Worst

Cos-Play Hero p309: Charles Still Can't Draw Trucks

Cos-Play Hero p308: Life is Like a Video Game

Cos-Play Hero p307: Son of Maskstaschen

You didn't really expect to get through this book without a tragic villain backstory, did you?

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!!!

Cos-Play Hero p302: Olivia and Penguin talk about boring identity issues while Sunglasses has a power trip.

I kind of wanted to space this out over two pages, but I worry about this comic's pacing. I don't want to spend too much time talking about Sunglasses' issues when the other half of the cast is trying to escape a life and death situation.
Also, that's supposed to be Sunglasses staring maniacally into a computer in the first frame. I'm not sure it came out right. I should have drawn him from a different angle. I might have to redraw that frame.

Cos-Play Hero p300: Charles Has Fun with Transparency Affects

Cos-Play Hero p298, p299: Eli?