"The Green Man" archetype is actually in a lot of different modern media and usually keeps the wild man/wacky jester character themes as found in the original meaning, to some extent.
>Green Man costume from Always Sunny in Philadelphia: Charlie dons a green screen suit and calls himself the Green Man, while wearing the suit he becomes more chaotic and rambunctious than usual.
>Fern from Adventure Time: As posted about above, Fern is a grass-bodied version of Finn, making him plant based person like what the Green Man usually is depicted as. He assumes the "Green Knight as also shown there, which has direct ties to the green man. Also worth noting Fern is antagonistic because he is literally controlled by a demonic parasite.
Peter from Peter Pan: A jolly and magical being who never ages and invites children to an island of wonder and adventure. The surname "Pan" evokes the idea of him being a satyr of some kind, which the Wild Man was often said to be.
>Link/Deku Tree from The Legend of Zelda: Link is stated to be based on Peter Pan, and even keeps the green tunic. Personality wise Link doesn't fit this motif, but the Deku tree, being a wise and plant-like forest elder, does. Interestingly, Link is wearing blue instead of green in Breath of the Wild, where he actually does fit the wild man motif much better this time.
>Luigi from Super Mario: Mario's younger twin brother. Often called "Mario's shadow", this shows there is a vaguely negative aspect between the two. He is even called "the man in green" in a few games. In one game he also fuses with a jester and a relic of chaos into an extremely powerful being, for some reason Luigi was the "perfect vessel" for this to happen. The symbolism there is very heavy.
>Jolly Green Giant: The frozen vegetable brand mascot. Since the wild man has Nephilim (giant) origins, I really don't need to say much here that isn't obvious already.
I'm sure there are a lot more but I can't think of them at the moment.