This has always bugged me about SEIV... None Atmosphere
breathers!. If there's no atmosphere then there's atmosphere then what are they breathing! As far as I can see, an NA "breather" would be just fine in almost any atmosphere that isn't toxic to his skin and won't burn/freeze him. Of course, I can see that this would be absurdly overpowering in SEIV, but still, kinda annoying to me.
Kinda sad that this is my biggest complaint about SEIV.
