Full Throttle/WMG

Ben is Malcolm's illegitimate son
His second name is never given in the original game. Later Word of God is that it's "Throttle" but then, it may have been his mom's maiden name. Their ages fit. Malcolm is shown to not shy away from extramarital affairs. When they first meet, they are immediately sympathetic towards each other. Bike-riding is In the Blood of all Corleys. Ben and Mo wouldn't be the first example of borderline Brother-Sister Incest that LucasArts produced (plus, one is a princess, the other is a farmboy). Lastly, the Ironic Echo when Ripburger holds the plate with "Can't Beat A Corley" in the Final Battle makes much more sense if the Corley in question is Ben rather than Mo who didn't do anything useful in the final showdown at all.
 * Pretty sure that the Ironic Echo was referring to his literally beating Malcolm - he beat a Corley, and now he's been hunted down and dropped to a splattering death.

Malcolm Corley and Malcolm the Jester (from Kyrandia) are the same person
Same name, and they look pretty similar. It's the only reasonable explanation.

The entire game takes place in an afterlife for Chaotic Good Badass Bikers.
The world consists of nothing but endless stretches of road to speed on, babes to flirt with, other bikers to pick fights with, and even the occasional stupid disrespectful jerk to drop off a cliff. If they screw up and get themselves killed, all they need to say is, "Oops. Let me try that again." And they can try that again. Light 'em up, brother.