Friedrich is Kiri's younger brother, who she assumes is dead after the incident that separated them both. At this point in the story he's meant to be more of a mystery, but he's erratic, excitable, and very easily upset, being prone to fits of despair and rage. He has a loose grip on sanity that he's desperately trying to hold on to. He's cut himself off from outside contact, spending his days working towards an unknown goal.

I imagine him to have a higher pitched voice (though still sounding adult) that sounds very jittery, unhinged and a bit annoying.

Currently very few lines.