Trender Man is a meme and spinoff of the Slender Man. Unlike Slender Man he is not a myth, but intended as a parody.
Trender Man was made when someone saw how a mannequin looked like Slender Man, but in fashionable clothes instead of a suit. He was put online as a cousin of Slender Man.
Trender Man looks somewhat like his cousin, Slender Man, but with a brown sweater (sometimes portrayed as a sweater vest), a white undershirt, and brown pants. His skin is also darker than Slender Man's, being between his white and a normal human tan skin. In some pictures, however, he is just as pale as his cousin. His clothes also change sometimes, since a fashionable person can't wear the same outfit all the time.
Fans usually depict him with white tentacles. Some fans have also taken to drawing him with glasses.
He is portrayed as a drama queen who can not stand people who go for the "swag" look or who wear crocs. He also is shown as somewhat self absorbed due to his fashion sense. He often becomes overly enthuisiastic about helping others find better outfits so that others can become more fashionable. Whether this is because of a need to help others or an intolerance for what he percieves as unfashionable outfits is left up to interpretation.
Trender Man is sometimes portrayed trying to convince Slender Man to wear something more fashionable.
It is unknown if he has any special abilities other than his keen fashion sense.