The tiny race Bonnie belongs to, small enough that a modified flak helmet dwarfs her head.
Carl spots "the small gnomish girl" peeking around the back pile of bombs aboard Party Planner — Bonnie, one changeling and one gnome having stowed away together with Skarn.
Her size makes the Gnomish Farseer Helmet that appears on her head ridiculously large, turning her into a steampunk bobblehead, and Carl can only think "Jesus" while watching the tiny gnome track upward with a crew-served gun and destroy three missiles.
Very small humanoids; Bonnie is dwarfed even by a small-sized flak helmet and an airship door gun.
Bonnie's race, and the source of the farseer optics on her helmet.