Caustic Lore
Alright, so I just had a moment when thinking about the lore of Caustic and stuff.
So, as revealed by the devs recently, Caustic gas is corrosive, which explains why it damages Pathfinder and other robotic characters. Caustic also knows a secret chemical that makes him immune.
But, it is implied that Caustic's gas mask and goggles aren't a defense against his own gas.
I have two different theories for his goggles.
1. They are similar to ski goggles. Ski goggles are usually specialized for a certain type of weather, like if it's snowing or not. Whatever tint they have help visibility in the right conditions. Obviously, this doesn't exactly translate to being able to see through gas, but then again Caustic can't completely see through it. The highlighting could be explained as just an exaggeration of the increased contrast. This doesn't explain, however, why his eyes glow/look weird. His goggles look like ski goggles as well, so there's that.
2. Side effects of the aforementioned chemical. It's possible that this chemical he has that makes him immune to his gas has a side effect of allowing him to see through his gas, at the price of having much more sensitive eyes. This could explain why his eyes are all glowy white, and the goggles.
3. Could be some combination of the two. He gains some ability from the chemical, but needs the goggles to see normally or something.
I think his mask is more like Bloodhound's mask, where his respiratory system was damaged beforehand and he needs a mask to filter the air. Some people have speculated that Caustic suffered from some respiratory disease in the past, possibly cystic fibrosis. Or, it could be something entirely different, but who knows? We'll have to wait until S5.
Sidenote: I'm not sure why the text sudenly inverted colors. I accidentally highlighted it while writing this, and I don't know how to turn it back. I can change the text color, but not the highlight.
