Eivvi is an elf knight whose magically inflated abdomen rises behind her like a pale, taut hill, broad enough to dwarf the nearby watchtower. Its surface shines with sweat and faint, shifting silver-blue veins of stormlight; deep, audible gurgles roll through it at irregular intervals. She plants her boots wide and moves with a careful, rolling sway, as if perpetually balancing a loaded siege engine. Her face is long and composed, her pointed ears crowded with tiny brass wind-chimes. The unexpected detail is a set of bright, hand-painted birdhouses strapped to her armor, each made by children from the villages she protects.

Eivvi is disciplined about danger but impulsive about taking blame. In public she is matter-of-fact and reassuring; with frightened children she is gentle and unexpectedly playful. When alone, she grows restless and obsessively checks her pressure gauge. She wants others to trust her, yet dislikes being treated as a fragile problem to solve.

Eivvi was raised among the wind-carved terraces of the elven borderland of Salla's Whistle, where her family maintained signal towers and taught young sentries to read weather. She became a knight after a raiding giant shattered the old pass-road and trapped a caravan beneath a collapsed watchtower. Eivvi held the remaining archway alone until rescuers arrived, learning that courage was not the same as being unafraid. Years later, an experimental storm-seal intended to protect the frontier fused to her body during a lightning strike. Her abdomen swelled into a vast, pressure-filled reservoir, and the first uncontrolled release blew the windows out of a crowded fortress and scattered its roof tiles across the valley. No one died, but the court blamed her and several villages now fear her. She has since trained to direct the force safely. Her former mentor, Captain Kerttu, still argues that she should surrender the seal for study; Eivvi's younger brother Oskel secretly sends her reports of the seal's worsening surges. She is currently trying to locate the artificer who designed it before the pressure becomes impossible to contain.