Qbby

Qbby joins the battle!

The Mii
Use the black Tracksuit to represent his little baby legs and no voice.

The Moves
Exploding Side Kick and Burning Dropkick allow Qbby to detonate the box. ESK is slower but has armor so you don't get knocked back by the explosion, and BDK is faster but less safe. Qbby's main vertical movement option is usually the Up Hook, where he travels along his boxes. To somewhat match the control of this move, use Helicopter Kick. Finally, Head-On Assault references the Slam from BOXBOY + BOXGIRL!.

The Style
Qbby has somewhat meager movement, so use Tank Style to nerf it while giving him more killpower and protection against the box.

The Spirits
Fire/Explosion Resist ↑ gives Qbby more safety in dealing with the boxes. Thrown Items ↑ lets him throw the box slightly farther for positioning. Finally, use Item Gravitation for yet more control over the box.

The Item
To represent the box based gameplay of the BOXBOY! series and more specifically the Bombox from BYE-BYE BOXBOY!, turn on the Blast Box.

Analysis
Qbby is heavily dependent on his box. It offers great killpower, but it is also his only projectile and his recovery leaves something to be desired. He also has to watch out for opponents detonating the box before he can, leaving him somewhat vulnerable.

Unlock Battle
To unbox Qbby, fight him on his home turf: a quadrilateral monochrome void.

If a rule setting isn't listed, it is the default setting: Stage: Pictochat Style: Stock Stock: 3 Time Limit: Infinite FS Meter: Off Spirits: On CPU Lv.: 9 Stage Hazards: Disabled Items: Low Item Selection: Blast Box

Summary
The Ray MK II with Tank Style: 1 Support Spirit with Fire/Explosion Resist ↑ 1 Support Spirit with Thrown Items ↑ 1 Support Spirit with Item Gravitation Item Fighter Item: Blast Box