Lombre is a bipedal Pokémon that is mostly green with some light blue markings. Its face, ears, arms, and back are light blue. It has stubby, round ears, large eyes with small pupils, and a red bill-like mouth. There is a large lilypad on its head, which has a notch in it and resembles a sombrero. It has long arms with four red fingers and a thumb on each hand and feet with three toes. Its entire body is covered in a thin, slimy film that creates an unpleasant sensation when touched. It is sometimes mistaken for a human child.
Lombre is a nocturnal Pokémon that sleep on a bed of water grass during the day. Very mischievous, this Pokémon will tug on fishing lines from underwater and pop out to startle people. It feeds on aquatic moss that grows on rocks in the riverbed.
Multiple Lombre appeared in One for the Goomy!, after being startled by Team Rocket when Inkay attacked the river with Psybeam. They subsequently attacked Team Rocket and Ash's group using Bubble Beam along with Lotad, who were using Energy Ball. This caused the groups to get separated from each other.
Lombre is nocturnal - it will get active after dusk. It is also a mischief-maker. When this Pokémon spots anglers, it tugs on their fishing lines from beneath the surface and enjoys their consternation.
They are the only Pokémon that can have the Ability Rain Dish without it being their Hidden Ability.
Lombre's appearance is similar to the Japanese yōkai called the Kappa. A kappa has a dish on its head filled with water that is the source of its power, called a sara, just as this Pokémon has a similar dish and uses Rain Dish to replenish itself. It also has facial features similar to the kappa, such as a turtle-like beak. It also bears some resemblance to the Amefurikozō.
Lombre may be a combination of lotus and hombre (Spanish for man). It may also derive from sombrero (Spanish for hat), similar to its Japanese name.
Hasubrero is a combination of 蓮 hasu (lotus) and sombrero. Its German name, Lombrero, mirrors this meaning.