In Kingdom Hearts II, the Monochrome can be obtained in the Timeless River by sealing the door that Pete used to enter the world from Villain's Vale, the place in Radiant Garden where he and Maleficent reside.
The Monochrome's guard is a lifesaver float while the blade is a steamboat stack. The Keychain is a ship's wheel, possibly that of the Steamboat Willie. The teeth also resemble the steam whistles from Steamboat Willie. Other than that, the Monochrome resembles the transmitter of the Graham Bell phone.
The word 'monochrome' is another word for one color, and is often used to describe things that are in black and white, like the world of Timeless River. It could also reference the simple coloration of the Keyblade.
| Kingdom Key | Oathkeeper | Oblivion | Ultima Weapon | Lady Luck | Olympia | Jungle King | Three Wishes | Pumpkinhead | Wishing Star | Crabclaw | Fairy Harp | Divine Rose | Spellbinder | Lionheart | Metal Chocobo | One-Winged Angel | Diamond Dust | Star Seeker | Hidden Dragon | Rumbling Rose | Hero's Crest | Monochrome | Mysterious Abyss | Follow the Wind | Wishing Lamp | Decisive Pumpkin | Circle of Life | Sweet Memories | Photon Debugger | Gull Wing | Guardian Soul | Sleeping Lion | Fenrir | Bond of Flame | Two Become One | Fatal Crest | Winner's Proof | Hero's Origin | Shooting Star | Favorite Deputy | Ever After | Happy Gear | Crystal Snow | Nano Gear | Wheel of Fate | Hunny Spout | Starlight | Grand Chef | Classic Tone | Midnight Blue | Phantom Green | Dawn Till Dusk|
Wooden Sword | Struggle Bat