Knuckles the Echidna (Light Mobius) was the Light Mobius version of Knuckles the Echidna. Following a major power increase of unknown cause, he defeated his timeline's version of Dr. Eggman by becoming Chaos Knuckles, and afterwards attempted to recreate Mobius as he thought it should be, similar to the activities of Knuckles Prime as Enerjak. He was thwarted by Sonic, who used an alien device of unknown origin to nullify his powers. The resulting explosion cost Knuckles his right eye, and may have been the beginning of an antagonism between him and Sonic that continued for several decades afterward. They were able to put aside this feud in the face of two great threats to Mobius: first, a disruption in the space time continuum that threatened to destroy the planet, and later the tyranny of King Shadow. In his personal life, Knuckles also became the father of Lara-Su through his girlfriend Julie-Su.
Prior to Mobius: 25 Years Later
Before the events of M:25YL, Knuckles became Chaos Knuckles once again, and killed Dr. Eggman. After this, he attempted to recreate the world as he saw fit. In order to stop him, Sonic attempted to use an alien device to turn him back to normal. However, Sonic didn't know how to use the device, and while it did turn Knuckles back, it ruined his right eye, which he replaced with a biomechanical eye. The technology to replace his eye was apparently developed sometime afterwards, but Knuckles chose to retain the mechanical eye on account of its useful features, such as infrared vision. Prior to these events, Knuckles's father Locke came down with a condition which resulted in his death, but not before he admitted that he had been wrong in his methods of raising Knuckles and that his love for his son mattered more to him than anything else. (StH: #140, #143)
Mobius: 25 Years Later (Unaltered)
During this time, Knuckles and Sonic are downright hostile to each other, though their wives are able to convince them to have a small gathering at the pool. Prior to this gathering of their two families on Angel Island, Knuckles held an Unveiling party for Lara-Su, despite her protests and desire to become the next Guardian. Despite the conflict, the two enjoyed the party, though Knuckles found himself facing the melancholy of a parent with a child entering into adulthood. However, Knuckles finds out from Cobar and Rotor that Mobius is destabilizing, and could cease to exist if something isn't done. Knuckles shares this information with Tails and Sonic, and a solution is reached. It is decided that Sonic and Knuckles would go back in time to save Mobius. Before they go, Knuckles deems Lara-Su the new Guardian, having changed his mind after visiting his father's grave site and remembering their final days together. However, the status quo of the timeline is forever changed... (StH: #131, #132, #133, #134, #135, #136, #137, #138, #139, #140, #141, #142, #143, #144)
Mobius: 25 Years Later (Altered)
In the altered timeline, Knuckles is King Shadow's brutal enforcer, with seemingly no memories of the original timeline. When approached by Tails about the drastic changes, Knuckles bluntly refuses to get involved. He arrests Tails, Lara-Su, and the former King Sonic when the Dark Eyes discover that the three plan to overthrow King Shadow. When they are in prison, Knuckles reveals that he remembers the original timeline, and was just waiting for the right time to overthrow the tyrannical king. He then sets the three, along with a rather beaten Rotor, free in order to defeat Shadow. When Sonic confronts Shadow, Knuckles leads Queen Sally away from the throne room. After Lara-Su defeats Shadow, she walks out on the arm of her proud father, who says "Your mother's going to flip when she finds out you defeated King Shadow". (StH: #166, #167)
Five Years Later...
Five years afterward, Knuckles is given a mission along with Julie-Su, Mace, and Vector to try and make peace with the Mazuri Separatists, and left Lara-Su to "take care of things". Before leaving, Julie asked Lara-Su if she was sure she could handle things, to which she confidently replies that she could. After a couple of hours of hectic baby-sitting with the royal twins, Lara-Su then called her parents asking how things were going, to which they replied if Mace and and Vector were successful, they would be able to talk to Bill. Lara-Su then gave them her love before she had to hang up to rein in Manik and Sonia to bed again. (SU: #4, #5)
Knuckles's personality has changed little over the years. Aggressive and hot-headed, time and age had taught him to control his temper. With the lose of his eye, Knuckles has blamed Sonic and remains hostile towards him. However, if the situation calls for it, he would act civilly towards his former ally. As any father would be, Knuckles is overly protective of his daughter Lara-Su, especially on the subject of her becoming the next Guardian. Not wanting her to experience the trials and tribulations the he knew all to well. After the changes in the timeline, Knuckles became the loyal and brutal enforcer of King Shadow. Only to show later it was all just a ruse for until he could overthrow Shadow. After Lara-Su defeated Shadow, Knuckles had gained confidence in his daughter and finally allowed her to become the next Guardian.
Knuckles has gone through a radical design change, the most notable of which is that he wears clothes now and his mechanical eye. His new attire consists of his ancestor Hawking's cowboy hat, a brown jacket and matching belt and boots, mittens much like his old ones but with zips on them, black pants and a black top decorated with his birthmark.