Knuxadow

Knuxadow is the slash ship between Knuckles the Echidna and Shadow the Hedgehog from the Sonic the Hedgehog fandom.

Shadow the Hedgehog
In the neutral path in Shadow the Hedgehog, the second stage has Shadow in Glyphic Canon, where he encounters Knuckles. Knuckles asks him to help clear out the Black Arms aliens around the temple. The player can choose to carry out Knuckle's request or not. Throughout the level, Knuckles accompanies Shadow giving advice or commentary.

In Central City, Knuckles tells Shadow that the Black Arms have placed bombs in the city, minutes away from detonation, and asks for help diffusing them.

In Black Comet, GUN launches their attack against the Black Arms. Shadow encounters Knuckles there, who states that he will tear the aliens apart. The two travel to the core of the comet together. If Shadow does the Hero Mission, Knuckles and Shadow encounter Eggman with his Egg Dealer machine at the end of the level. They defeat Eggman and Shadow obtains the seventh Chaos Emerald.

IDW Publishing Comics
The Battle for Angel Island Shadow abandons the agreed-upon plan of fighting the Egg Fleet and joins Sonic and Knuckles in fighting Neo Metal Sonic. Knuckles is surprised to see him. Neo Metal Sonic reveals that all he needed for his final form was Shadow's biodata and starts to transform. Shadow and Knuckles continue to attempt attacking Metal Sonic in vain until Sonic has them retreat. Then Angel Island starts rumbling, and Shadow asks Knuckles what's going on. He explains that Angel Island is now falling due to the Master Emerald being severed from the island.

All or Nothing Zavok brings a horde of Zombots to Angel Island, including the infected Shadow. Knuckles decides to buy Sonic some time by attacking Shadow, though this gets himself infected as well. He states that he needs to keep the Zombots away from the Master Emerald and refugees. Knuckles continues to fight Shadow until he fully succumbs to the Metal Virus. Once Super Sonic and Silver get rid of the virus, Shadow and Knuckles return to normal. They briefly acknowledge each other before getting angry at Rouge, who was laying on the Master Emerald.

Sonic X Season 3
Trick Sand
 * Knuckles, alongside everyone else, is shocked to see Shadow.

Ship of Doom
 * Knuckles thinks back on when they saw Shadow, and remembers that he was always a weird guy.
 * Knuckles comments that they should never underestimate Shadow.
 * Knuckles asks what Shadow did and Shadow says he paused time around the ship.

The Cosmo Conspiracy
 * Knuckles confronts Shadow while he is hunting down Tails and Cosmo, though Shadow manages to lose him by fogging the room.
 * Knuckles stops Shadow's spin dash from hitting Tails and Cosmo, allowing them to escape. Shadow defeats Knuckles, although he was forced to remove his inhibitor rings.

Fanon
While not super popular Knuxadow is a common pairing in the Sonic fandom. Those that ship them is due to their similar personalities and relationship to Sonic. Although those that ship their Boom versions ship them due to their opposing personalities. Shadow being an "edge lord" and Knuckles being more of a himbo in that version. Some people put the pair as a rivalry with Knuxouge for Knuckles and Shadamy for Shadow. It is typically shipped alongside Sonilver and Blazamy.

On AO3, Knuxadow is the fourth most written ship for Knuckles and the eighth most written for Shadow. There are currently over 100 written works.

Fandom

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Variations

 * Knuxadouge refers to the ship between Shadow, Knuckles and Rouge the Bat
 * KnuxShadAmy refers to the ship between Shadow, Knuckles and Amy Rose
 * Sonuxadow refers to the ship between Shadow, Knuckles and Sonic the Hedgehog