Pansage is a simian, green-and-cream Pokémon. It has oval, black eyes, large ears with light green insides, and a tiny, black nose. There is a broccoli-like sprout atop its head. In the sprout's foliage are three yellow, tapered seed-like shapes. If eaten, the leaves in this sprout can alleviate exhaustion. Its muzzle, upper body, and skinny forelimbs are cream-colored, and its hands seem to have no fingers, aside from a thumb. Pansage's lower body is green with small feet, and its long tail is tipped with two leaves. Pansage dwells deep in the forest, where it collects berries to share with its friends.
In the Pocket Monsters BW manga, Cilan uses a Pansage against Red's Clefairy in PMBW02 when he tries to instigate a fight between Cilan and his brothers Chili and Cress. The three brothers use their Pokémon against Clefairy, however, their group attack backfires when Clefairy uses the effects of Pansear, Panpour and Pansage to make green tea.
Pansage was first seen, together with Axew, as a toy featured in two images seen July 2010, but it wasn't named and nothing was known about it. In the beginning of August 2010, a fake leak of the September issue of CoroCoro showed its own version of this Pokémon. Pansage was officially revealed on August 22, 2010 by Pokémon Sunday.
Pansage is based on a monkey and a tree; the fact that it is based on both may mean it might be based on the legends of monkey trees or possibly a visual pun on leaf monkeys. It, along with its two contemporaries, seems to be inspired by the three wise monkeys motif; with its mouth open, Pansage represents "speak no evil".
Pansage may be a combination of Pan (the genus of Chimpanzees) and sage. Sage may either mean a type of plant or a wise person, the latter possibly relating to the "three wise monkeys" motif of the elemental monkeys. It may also come from the German sagen, meaning to say.
Yanappu may be a combination of 柳 yanagi (willow) or 野菜 yasai (vegetable; an alternate reading of 菜 is na) and ape.