Good Timeline Version:Kekoa,the Red Rival of Sonic Jr

Good Time Scenario:Kekoa was guarding the Master Emerald,since his father had recently passed away.He was more stoic in his newfound duty than his father had ever been.(Your OC Here) happened to be near the Master Emerald shrine for their own reasons.

Bad Timeline Version:Kekoa,the Ultimate Incarnation of Enerjak

Scenario 1:(Your OC Here) knew who Enerjak used to be,and sought to find a way to cure their old ally of his megalomaniacal insanity.

Scenario 2:(Your OC Here) didn't know who Enerjak was,and planned to destroy him to restore the world.