19978 - safe, artist:bongwater777, knuckles the echidna (sonic), shadow the hedgehog (sonic), echidna, hedgehog, mammal, monotreme, anthro, sega, sonic the hedgehog (series), 2020, black fur, black tail, blushing, chaos emerald, cheek fluff

188898 - safe, artist:kyutsii_, knuckles the echidna (sonic), echidna, mammal, monotreme, anthro, sega, sonic the hedgehog (series), male, solo, solo male - Furbooru

#56199 - safe, artist:itshelias94, knuckles the echidna (sonic), echidna, mammal, monotreme, anthro, plantigrade anthro, sega, sonic boom (series), sonic the hedgehog (series), 2020, 5 fingers, clothes, male, quills, red tail, shoes, simple background

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263154 - safe, artist:toonidae, knuckles the echidna (sonic), echidna, mammal, monotreme, anthro, sega, sonic the hedgehog (series), 2023, 2d, frowning, looking at you, male, simple background, solo, solo male, unamused, white background - Furbooru

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144205 - source needed, useless source url, safe, artist:nibroc-rock, shade the echidna (sonic), echidna, mammal, monotreme, anthro, sega, sonic the hedgehog (series), 3d, digital art, female, solo, solo female - Furbooru

259575 - safe, artist:claudeartz, knuckles the echidna (sonic), anthro, sega, sonic prime, sonic the hedgehog (series), knuckles the dread (sonic prime), male, solo, solo male - Furbooru