jimblesX

What the picture shows

A pixel-art sprite of a blue-armored character with a rounded helmet, large eyes, and a white projectile held in one hand, posed in a crouched, ready-to-throw stance. Chatters likely use it to signal a playful threat, a "hadouken"-style attack, or throwing something at the stream.

No measured meaning yet. Used 46 times in 2 channels this month; one is written once chat gives enough evidence.