It is a large, humanoid Pokémon that is mainly green, with a bodily construction that closely resembles that of a bamboo shoot. It has a horn, that resembles a drill bit that appears to be atop of a structure that is similar to a hat with two small green eyes. There is another structure that stems from the "hat" that resembles hair. The lower half of its head is small, with a tiny mouth. Its long neck is divided into three segments; each one of the segments resembles a long, individual neck. Its lower body consists of a structure that is similar to a dress colored in different shades of green. Below the dress, there is what appears to be bamboo stalks. Its huge, disembodied arms resemble stalks of bamboo, with similar projections surrounding a larger opening.
According to the Aether Foundation, its most distinctive feature is the energy that it stores within itself: a flammable gas that it can shoot from its two huge arms. This is mostly used to propel itself in flight and for battle, but it is thought to have sufficient power and lift to even fly into space. Despite being a Steel type, Celesteela's body is plantlike and can absorb nutrients from the soil.
- At 2204.4 lbs. (999.9 kg), Celesteela is tied with Cosmoem as the heaviest known Pokémon.
Origin
Celesteela's body is based on bamboo shoots, it's arms on cut bamboo trunks, and it's overall shape and description resembles a space shuttle. This is in reference to The Tale of the Bamboo Cutter.
Name origin
Celesteela may be a combination of celestial, steel, and stella (Latin for star).
Tekkaguya may be a combination of 鉄火 tekka (gunfire) and かぐや姫 Kaguya-hime (Princess Kaguya).