Robbie the Rabbit is an anthropomorphic rabbit doll that has made appearances in many of the Silent Hill games. In some of his appearances, his mouth is covered with blood. For the most part, his appearance seems to serve little more than to provide an ambiguous level of unease to the player, due to the odd nature of his existence within the world of Silent Hill, his bright colors compared to the rust brown and dark red of everything else, and his recurring cameos. Most fans believe him to be sentient and believe that he is "watching" the player. This theory is not completely unfounded; the sight of Robbie staring at one is enough to unnerve any player.
Robbie's character could be seen either as an in-joke, a homage to the many horror films that depict bloodied rabbits as nightmarish killers, or it could even be an element of the town itself. An allusion to Silent Hill's dark sense of humor would be fitting as many of the game's plots involve the town's children in some aspect. It's possible he is simply there as a plot device to help tie each game together in a small, yet memorable way.
Silent Hill 3
Robbie's first appearance is in Silent Hill 3, where he is revealed to be a mascot for the Lakeside Amusement Park. Large models, possibly costumes, of Robbie can be found slumped in various areas of the park as if dead. It isn't quite clear whether or not there is a person, alive or dead, inside, or if the mascot is sentient. Robbie's 'corpse' can be seen many times while exploring the amusement park and he can also be seen as a doll in the souvenir store. Examining the tourist information scattered throughout the amusement park reveals that Robbie is one of its four animal mascots, along with Kathy the Kitty, Huey the Horse and Dawn the Duck. Heather Mason can also unlock a Robbie t-shirt to wear.  He also appears as the icon for the game's save file on a PlayStation 2 memory card, which shows him running, or, perhaps more appropriately, chasing.
Silent Hill 4: The Room
In Silent Hill 4: The Room, a Robbie the Rabbit doll is sitting on a bed belonging to Eileen Galvin.  While he isn't seen actually moving, he does change posture once Eileen is rushed to the hospital. He is then turned toward the player, pointing at Henry Townshend with a menacing expression.  A hot-air balloon of his head can also be seen outside of Henry's window, which, for unknown reasons, has its mouth bloodied.  Cynthia Velasquez also has a tattoo of Robbie on her right buttock, only visible when she is wearing her alternate costume.  In the Walter Sullivan Victim Files, Miriam Locane's silhouette is seen holding a Robbie the Rabbit doll.
Silent Hill: The Arcade
In Silent Hill: The Arcade, Robbie is an enemy that appears in groups at Lakeside Amusement Park. They have squeaky, high pitched laughs that can be heard before attacking the player. Aside from the the noticeable absence of blood around his mouth, Robbie wields a small variety of weapons, which include throwing axes, chainsaws and shotguns. Because The Arcade takes place before Silent Hill 3, it can be assumed that The Arcade is the reason for the bloody costume corpses in Silent Hill 3. In further connections to Silent Hill 3, a number of Robbies can be seen riding the Happy Carousel, which the players must defeat to progress (similar to the horses). Robbie also appears in the UFO ending's credits, where he is seen playing Gradius. 
Silent Hill: Homecoming
In Silent Hill: Homecoming, he is once again a doll. Alex Shepherd is required to retrieve the doll, which is stated to be a toy belonging to his brother, Joshua. When Alex asks what Joshua is doing there, Joshua says that he is looking for Robbie, which he has lost. It is here he poses as an interactive obstacle; failure to pull him correctly from a bloody hole in the wall results in Alex's arm being severed. But after Alex retrieves Robbie, Joshua runs away. He makes a reappearance later as a key to opening a door. The doll is not the instigator of these events, however.
Robbie acts as a tutorial guide for the game.
Silent Hill: Downpour
Silent Hill: Book of Memories
Robbie appears at the intro of the game as a doll. The player can also use the Konami Code to unlock a Robbie weapon.
Silent Hill: Revelation
In the first moments of the film, during the nightmare in Lakeside Amusement Park, Heather Mason crouches beside Robbie on the ground, and as she catches her breath, she glances at him and he turns his head at her, causing her to run away. During the bus ride to Heather's residence, a seemingly mentally unstable man is seen giggling and enjoying his Robbie doll. When Silent Hill shifts to the Otherworld, Heather passes through a corridor and there is a Robbie figure next to a birthday cake. Finally, in Lakeside Amusement Park, Heather crouches beside Robbie again, his face covered with blood, but he doesn't move.
Cameos in other games
- In the Wii game Elebits, there are a few objects portraying Robbie that are scattered throughout the amusement park levels. The in-game description of the Robbie costume indicates "He loves ketchup. (That's not blood!)".
- In the online game Metal Gear Online bundled with Metal Gear Solid 4: Guns of the Patriots, a mask of Robbie that covers the whole head is a downloadable reward for those who earn enough Reward Points.
- In the hack-and-slash game The Sword of Etheria, Robbie costumes can be unlocked (and bought) by a player as costume for their characters.
- In the Bishi Bashi arcade game.
- In Konami's Krazy Kart Racing, which also features Pyramid Head. 
- Robbie appears as a single full-bodied costume for PlayStation Home, for both male and female avatars.
- Concept art suggests Robbie was originally called "Tommy."
- The official The Arcade website spells Robbie's name as Robby.
- Nearly 100 Robbie dolls appear on set for Silent Hill: Revelation.
- Usagi — Usagi is a 2 and a half minute short-film. It features many variously colored Robbie the Rabbits in a hospital like setting.
- DANCE EVOLUTION DANCE MASTERS SILENT HILL ROBBIE !!!!!!!!!!! - 着ぐるみ兎が踊ってみた — Another short-film, with Robbie dancing with a few more dolls resembling him, but different in color.
|Eric Lake - Tina - Bill - Jessie - Ryan - George - Emilie Anderson - Frank Anderson - Michelle Anderson|
Hanna - Lorraine - Captain Lake - Scott Fairbanks - Greys
|Creeper - Double Head - Greedy Worm - Gum Head - Insane Cancer - Mama - Mothbat - Numb Body - Nurse - Phantom - Pyramid Head - Robbie the Rabbit - Scraper - Split Worm - Tremer - Tuberculosis|
|Brookhaven Hospital - Central Square Shopping Center - Hazel Street Station - Jacks Inn - Labyrinth - Lakeside Amusement Park - Silent Hill Historical Society - Spiral Staircase - Toluca Lake - Toluca Prison|
|Flashlight - Fog World - Little Baroness - Monster - Otherworld - Radio - Real World - Siren - Welcome Sign|
|Heather Mason - Christopher Da Silva - Vincent Cooper - Claudia Wolf - Leonard Wolf - Dark Alessa - Douglas Cartland - Alessa Gillespie|
|Rose Da Silva - Dahlia Gillespie - Suki - Travis Grady - Order Soldier - Detective Santini|
|Armless Man - Delusion - Leonard Wolf - Lobotomy - Mannequin Monster - Memory of Alessa - Missionary - Nurse - Pyramid Head - Valtiel|
|All Hallows High School - Brookhaven Asylum - Central Square Shopping Center - Jacks Inn - Sanctuary - Silent Hill, West Virginia - Lakeside Amusement Park|
|The Brethren - Halo of the Sun - Monster - Manifestation - Otherworld - Fog World - Real World - Robbie the Rabbit - Seal of Metatron - Siren - The Order - Great Knife - Welcome Sign|