Methanosian

Methanosians are a floral sapient species from the swamp planet Methanos.

Biology
Methanosians are descended from carnivorous swamp plants, but evolved into plant-like herbivorous humanoids at some point in their evolution. They can break down rotting plant matter in their stomachs to produce flammable methane that can be used for their fire attacks.

Early Evolution
Methanosians undergo a metamorphosis process that results in them "blossoming". As a result, their pyrokinesis, enhanced strength, and natural durability are amplified. Their chlorokinesis, meanwhile, is modified so that they can control sentient plant life.

Abilities
A Methanosian appears to amalgamate the abilities of a Pyronite and a Florauna, being able to manipulate both plants and flames.

Methanosians are strong enough to push down a large Highbreed weather tower.

Methanosians can reattach and regenerate missing body parts.

Weaknesses
Methanosians have a swampy stench which other beings, especially Incurseans, will find repulsive. This is due to their race coming from a swamp planet.

Omnitrix Transformation
The Omnitrix's Methanosian representative is named Swampfire, who first appeared in the Alien Force episode "Ben 10 Returns: Part 1". Swampfire has appeared in almost every subsequent series except the reboot.

The Ben Tennyson of Dimension 23 has an equivalent of Swampfire named Mr. Mucky, who was confirmed to exist by unused artwork from Omniverse.

Swampfire has also been used by Albedo, Vilgax's Bioid army, and Anur-Mirrored Ben.