Kneecaps the Echidna

Knuckles first learned of his younger brother's conception from his mother Lara-Le after the Echidnas were brought back from the Twilight Zone thanks to the powers of Chaos Knuckles. Lara revealed it during a heated argument with Knuckles over his support of Dimitri, in which she decried Dimitri as a dangerous threat to her children, which briefly had Knuckles confused as he was an only child at the time. Due to his temporary death and then being cut off from Angel Island for a year, Knuckles was absent when Kneecaps was born and never received word of it from his parents.

Kneecaps first met his older brother when Knuckles returned to the island with the Chaotix and Sonic the Hedgehog to rescue Locke from the Dingoes. Kneecaps took to his older brother immediately, hitting him with his rattle and otherwise playing with his older sibling. Weighed down by the knowledge that his people - including Wynmacher - believed him to be the Avatar foretold by the Ancient Walkers, by his weakness upon exposure to the Master Emerald, and by all that had befallen his home and people in his absence, Knuckles was unable to reciprocate his younger brother's affection, much to Kneecaps' dismay.

Kneecaps and his parents lived for a time amongst the Dark Legion, but relocated to a small village with other survivors of Echidnaopolis following the beginning of the civil war between the Flame Legion and Frost Legion. Later, Kneecaps was among the many sent by the second Enerjak, a brainwashed Knuckles determined to protect his people, to the original Echidna city of Albion, which had been leveled by Dr. Eggman. Kneecaps remained innocent through this traumatic period, and once caught a glimpse of Knuckles as his older brother flew overhead, wracked with guilt due to his role as Enerjak.