Shane Brandon McMahon is the eldest of Vince McMahon's children, and like his sister, Stephanie, has been heavily involved with Professional Wrestling ever since young adulthood. He spent over twenty years with WWE, working his way up from ring crew to referee to wrestler to GM-figure. He is one of the only fourth-generation wrestlers, and was the former head of Global Media for WWE before leaving in early 2010 to become the CEO of an Asian internet company.That Other Wiki has an article about his life and career here.
The one guaranteed way to piss Shane off is attack his mother. He attacked Triple H when he tried to Pedigree Linda, despite them both being on the side of the McMahon-Helmsley Regime; turned on Vince after his abuse had left Linda catatonic; and was out for Kane's blood when he tombstoned Linda.
As a face, he's generally portrayed as protective of his family.
Dance Battler: One of his signature taunts - which he freely admits he stole from Muhammad Ali - is dancing and weaving from side to side, swinging his arms, and then punching whoever he's fighting in the face. The dance, which he does during his entrance as well, has been dubbed "The Shane-O Shuffle".
Deadpan Snarker: Shane doesn't even need to talk to get this aspect across. His utterly deadpan reaction to Vince calling out God was to give Vince a "WTF" look and take a single, but significant, step back.
It was actually subverted with that first example, as it was later revealed that Shane was actually still The Dragon to Vince the whole time, as Vince was the Higher Power that masterminded the whole plot to kidnap Stephanie just to show "Stone Cold" Steve Austin how far he was willing to go to screw with him.
This was actually an aspect of Shane's character in the early days, as he was built up to be the "heir" to Vince's throne in the future in kayfabe and in real life. It wound up being apparently subverted though as Vince is still running WWE and Shane has resigned from his position, though only time will tell whether this is truly the case.
Even Bad Men Love Their Mamas: Harming Linda is his biggest Berserk Button. Case in point in one storyline when Stephanie and Linda exchange slaps, and then Triple H tries to put the Pedigree on Linda. Shane immediately attacked Triple H, though they were both on the same side against her.
Groin Attack: One of his more infamous WWE moments involved a rather unfortunate encounter with Kane, a car battery, and a set of jumper cables.
Guy Posse: The Mean Street Posse. They'd wanted Shane to have an entourage for his feud with Test and were going to use some indy wrestlers. Shane convinced the bookers that his actual high-school best friends could be more annoying than anyone they cast. He was right.
To elaborate, "the spots with the glass" refers to Kurt attempting to German-suplex Shane through the panes of glass used for the set. Apparently, they hadn't gotten the right type of Plexiglass and the glass refused to break. Shane took a hellacious German suplex and landed on his head. He told Kurt to suplex him again, and the glass broke. Then when they tried to do the same spot back out onto the ramp, the glass didn't break again. Kurt reportedly tried to stop the match, but Shane (who was close friends with Kurt in real life) told him they'd never get the chance to do this again. Kurt suplexed Shane through, and that shot of Shane going through the glass the final time has become iconic, used for years as the very first shot of the Smackdown video package.
To elaborate more: When Shane was bouncing off the Plexiglass, he was landing neck-and-noggin first on the concrete floor.
I Am Not Left-Handed: Right-handed, but throws left-handed punches. Opponents get a nice surprise when they attempt to grab his left hand, and Shane goes and uses his actual dominant hand.
I Have the High Ground: Ranging from a simple turnbuckle to the top of the big-ass screen used as WWE's set, the Titantron. Jumping off high places is Shane's hat.
Particularly pronounced during Vince's religion-based Sanity Slippage against Shawn Michaels, where he started fancying himself as a counterpart tothe Almighty Himself, they had a segment in church where Shane was privy to his father's insane ramblings. Vince had Shane read a modified version of the Lord's Prayer, complete with excerpts about Vince's "omnipotent semen"; Shane stopped mid-reading because it was getting... weird. Later, Vince got on the podium and challenged God to strike him down where he stood. Shane slowly stepped away from him, not wanting to get caught in case of actual lightning. Then the next week, Vince started a promo by stating that Shane had asked him if he was going to hell. He would end up introducing McMahonism to the world.
His Wham Line kick-start to the InVasion storyline, revealing he'd bought WCW right out from under his father.
Subverted during the Higher Power storyline, when it seemed at first that Shane had turned against Vince to join forces with The Undertaker, only for it to be revealed that Vince was the Greater Power giving them orders and it was all part of his plan.
Warrior Prince: Being the son of WWE's owner, he can be considered as such.
Why Do You Keep Changing Jobs?: Has been, in order - a referee, part of his father's entourage, a wrestler, the owner of WCW, a wrestler again, and finally, co-owner and GM of WWE.