Naiell Treffor

Naiell Treffor is the leader of The Glaciers, and former top pupil at the University of Snowcake. The only real lore we have on her is that she's a mercenary leader, and that Ruyi copied her essays in school.
She was ultimately unwilling to back up her comrade Markys Vaspalar in his proposed attack against the Ho'ruushi, and while presumable she had good reason, we didn't stop to find out why and basically kidnapped her top general.