Narciso Anasui is a male inmate at Green Dolphin Street Prison. Despite being introduced as a cold, calculating killer, he quickly falls in love with Jolyne's tenacious spirit and becomes wholly motivated by protecting her.
Foo Fighters is a colonial organism that appears at chapter __ of the manga, or episode __ of the anime. I often jokingly refer to them as the only plural they/them.
They both deeply love Jolyne. Both of them have protecting her as their highest priority.