Boom Primids (ブーメランプリム Būmeran Purimu, Boomerang Prim in Japan) are a type of Primid that appears in The Subspace Emissary story of Super Smash Bros. Brawl. It wields a yellow, blade-like weapon that functions as both a sword for melee attacks and a projectile for long range attacks. A Boom Primid will regularly throw its boomerang unless the player gets close, which can be reflected back at it to do damage. Boom Primids, like normal Primids, are low in endurance, and can normally be taken out in a couple of hits.
Boom Primids will often keep their distance, while using their long range attack. When thrown, their weapon moves rather slowly, but has a large hitbox that can make it rather difficult to avoid. If the player attempts to use aerial maneuverability to evade, the Boom Primid will either throw vertically or jump and throw. When the player gets close, the Boom Primid will instead attack with their melee attack. The melee attack, while having low reach, has low start-up lag that can catch an unwary player off guard. Both the long range and melee attack produce slightly below average damage and knockback, but are capable of KOing at very high percentages on the harder difficulties.
An interesting quirk of the Boom Primid is when a player is using a reflector, they will not throw their weapon at them until the player puts down their reflector.
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A Primid with a boomerang--hence the name. This Primid will use the boomerang to attack from afar (which is pretty much what you'd expect) and adds to its arsenal with close-quarter combat strikes. These two attack patterns may lead you to believe that it has no fun with boomerangs, but no! Boom Primids are just a little on the shy side.