Galeem

Galeem, also known as the Lord of Light and known in Japan as Kiila, is one of the two main antagonists of Super Smash Bros. Ultimate's World of Light mode, resembling a large sphere of light surrounded by -like wings with shifting colors and patterns on them. In the opening, it is commanding a horde of Master Hands against the various playable fighters. However, it then absorbs the Hands, turning into a black hole, and uses them to unleash a devastating attack, which only Kirby manages to escape from by pushing his Warp Star to its limit. Everyone else is hit with snaking yellow beams of light, which imprison them within the eponymous World of Light, before the beams then continue outwards and cover the planet, turning everyone else into spirits, and then covering the rest of the solar system, the galaxy, and continuing to expand outwards from there. The spirits possess or clone the captured fighters, and Kirby ends up in the World of Light and must save them.

His English name is likely a corruption of the onomatopoeia "gleam," often used in contexts relating to light.

Galeem has a dark counterpart, known as Dharkon, who plans to engulf the universe in darkness.

The fighters eventually defeat both Galeem and Dharkon.