Alarm Sheep (Valkyrie Crusade) appears in dreams to wake those who counted sheep to fall asleep.
Princess Luna (My Little Pony Series), enters Apple Bloom's dream.
The Powerpuff Girls (The Powerpuff Girls), enters the Sandman's dream.
Death 13 (JoJo's Bizarre Adventure Part III Stardust Crusaders)
Remmy, A.K.A. Experiment (Lilo & Stitch)
Dream Beavers (Teenage Mutant Ninja Turtles 2012 TV series)
Castiel (Supernatural) in Dean Winchester's dream.
Riku (Kingdom Hearts 3D: Dream Drop Distance) unwittingly entered Sora's dreams during their Mark of Mastery exam, becoming a Spirit Dream Eater.
Kurumu Kurono (Rosario + Vampire) can enter the dreams of others using her tail.
Danny Fenton/Phantom (Danny Phantom) can use a form of his overshadowing power to entering Tucker's dream and manipulate it on the inside to wake him up.
Doctor Destiny (DC Comics)
Scary Terry (Rick and Morty)
Living up to being called the "Dream Demon", Bill Cipher (Gravity Falls) can make a deal with someone by entering their dreams. He entered Stan Pines' mind to get the combination to the safe after making a deal with Gideon.
SpongeBob SquarePants was able to travel between others' dreams in the episode "Sleepy Pants".
Princess Luna (My Little Pony: friendship is magic) entering the dream of the mane six.
Polnareff and kakyoin encounter death 13-2
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