Is that thing in the top left-hand corner meant to represent anything at all? I can't pick its reference to anything I know of.
https://dic.pixiv.net/a/%E9%A6%96%E8%BC%AA%E4%BB%98%E3%81%8D According to this tag, it's the joke animal version of the protagonist from Armored Core: For Answer (hence the interface and references to charging a weapon). The reason he looks like a furry cat is because of the original ASCII art depicting him as such. Following from this, the green glow is likely from Kojima particles. Kasumi is referencing the protagonist's operator Serene Haze aka Kasumi Sumika who is known for being a harsh taskmaster.
https://dic.pixiv.net/a/%E9%A6%96%E8%BC%AA%E4%BB%98%E3%81%8D According to this tag, it's the joke animal version of the protagonist from Armored Core: For Answer (hence the interface and references to charging a weapon). The reason he looks like a furry cat is because of the original ASCII art depicting him as such. Following from this, the green glow is likely from Kojima particles. Kasumi is referencing the protagonist's operator Serene Haze aka Kasumi Sumika who is known for being a harsh taskmaster.