Monk.
Monk was a Mobian gorilla who lived on the Floating Island who took great pleasure in tormenting Knuckles the Echidna when he was younger. Because of this, the Brotherhood of Guardians took desperate measures and threw the gorilla off the Floating Island. When he returned, Knuckles had grown stronger and more fierce and was not as prone to being bullied. Both he and Knuckles were then made part of a game hunt by an Overlander named Hunter and they were forced to work together before Monk was electrocuted and fell off the Floating Island again, this time to a certain death.
History
Bullying Knuckles
During the early years of his Guardianship, Knuckles would continuously square off and lose against Monk, who took great pleasure in tormenting the younger Mobian. Unwilling to stand by and watch, disguised members of the Brotherhood of Guardians incapitated Monk with their powers, tied him up and threw Monk off the island. Several years later, as the island was passing a mountain, he managed to climb back on, wishing to return to the way things had been before, looking to beat up Knuckles for old times sake. However, years of training and growing had changed Knuckles, and he was no longer so easily put to use as a punching bag. Despite this Monk refused to give in, and they fought each other for awhile. (KtE: #30)
Enter: The Hunter
However, Monk and Knuckles were forced to put aside their differences when Hunter made them the quarry in his Floating Island hunt. Knocking out the gorilla and bringing them both back to his ship where he would outfit them with linked shock collars that would activate when too far from the other. Wishing a more interesting hunt he gave them a headstart before going after them, after realizing the effects of the collars the two of them decided to work together to evade Hunter. Making it through the forest and down to the underground Hydro City, where they decided to set a trap and fight. Before they could set something up Hunter opened fire and seperated them, focusing fire on the echidna Hunter was stunned to discover that he missed and Monk jumped him despite the pain caused by the collar. Forcing the overlander down and moving in for a kill. (KtE: #31, #32)
Death & Aftermath
Monk was unable to finish him off as Hunter electrocuted Monk while they were tangling, causing the gorilla to topple and fall. This time, however, the gorilla perished, either from the fall or the shock, perhaps both. The victory was short-lived for Hunter,in a fit of fury Knuckles unleashed a torrent of Chaos, shattering his collar and critically injuring the homocidal overlander to the point of unconsciousness. He had Hunter confined to a holding bubble in the depths of Haven. (KtE: #32)
Abilities
Agile and strong even by gorilla standards, Monk was the young Guardian-in-training's physical superior for most of Knuckles's childhood. Years later he was as strong as ever, though no longer Knuckles's superior. In fact, they seemed to be equal in terms of physical prowess, which is impressive considering Monk is an average Mobian while a mutated echidna.
Personality
Boastful and easy-going, Monk had no overriding ambitions in life, perfectly happy with lounging around in a tree and occasional bullying youngsters. He took great pride in his physical prowess and found it hard to accept it when faced with opponents of equal strength.
Background Information
Monk seems to be inspired by King Kong, as both are large primates with an affinity for falling from great heights.
Appearance
Monk was an imposing, purple furred gorilla, taller than Knuckles and even Hunter with brawny limbs clearly displaying great innate strength.