I have to choose Luke Harper.
Luke Harper goes into SummerSlam with Bray Wyatt (Unlike how the WWE will book it) Wyatt's win after outside interference of Rowan ( being unable to wrestle, doesn't stop one from being on TV USO, Bryan etc). Rowan cracks a <insert chosen weapon> over the head of Reigns cause the loss.
Wyatt's cut a promo about refocusing attention to ending the Undertaker's life, This backfires when Undertaker ducks an attack leading to Harper dropping Lesnar with a big boot, costing Lesnar the match and Leaving Taker vs Lesnar 1-1 split. ( leaves opens a Rubber match )
Wyatts all hit the Promo deck in the back (no one ever goes after Wyatt during promos) talking about Taker being done and they are coming after him they want a buried alive match (This match will never happen, just part of the promo) Lesnar finds them in Boiler room (Just thought o Foley) and takes out the whole family and breaks down Rowan.
Following week, on Raw, Lesnar, Reigns, and Ambrose vs Wyatts and Mystery person. The match never finishes when Lesnar can't play well with others and reigns and Lesnar go at it.
As we build towards Survivor Series, You have the Wyatts challenging Lesnar to a Classic Survivor Series match. Lesnar accepts, Heyman begins trying to recruit each week but no one comes. No one likes Lesnar. Wyatt now gets to cut promos on the lack of friends followers etc.
With Lesnars Limited booking dates, Heyman gets to cut his promos, But Lesnar is not there. Allowing the Wyatts to take him, Figuring without Lesnars mouth piece he can't recruit anyone. But The Wyatts recruit some fodder like Bo Dallas (just because he is Bray's RL brother and his gimmick is failing) and Curtis Axel who needs a new gimmick with Hogan banned. You could even toss in someone like Sheamus.
{Why Sheamus, Simple As the MITB holder, he will at some point face Lesnar, Sheamus came in as a heel brawler and needs to get back to the top when he beat Triple H this would give him this platform of beating Lesnar once}
The 2nd Smackdown before Survivor Series Paul Heyman beatin and bloody makes his way to the ring and takes the water from announcers chugging as much as possible. (Got to sell the kidnapping) He says he is free now and On Raw Lesnar will have a team. This ends the show.
Raw show begins with Paul Heyman black and blue with Lesnar. He cuts his Promo, speaking on this is no longer a Lesnar Fight this is a Revenge fight, he has many friends and he is calling in all his chips from his Heyman guys. None are friends of Lesnar but will be fighting to defend Heyman. Bray Wyatt cuts a Promo with his team behind him, About taking out Lesnar and how Lesnar is weaker without Heyman upset he got away, He vows that he will take Heyman before the end of the Night.
{This will keep people watching, those who know who Paul Heyman guys are will be blowing up twitter with speculations, If the WWE could keep it a secret it would be better}
The end of the Night Paul and Lesnar head to the Ring and mock the Wyatts whose music hits and the whole team stalks to the ring, Lesnar ready to fight them all off alone gets held back by Heyman. He explains this is not a fair fight and he has no desire for it to be that way, But he means for the Wyatts.
The USOS Music hits (Since their dad was a Heyman guys and basically paved the way for the Boys) this generates Mild response from the crowd, The Heyman Announces Mean Mark....and says oops, sorry for those who don't know. The Undertaker's Music hits. (Yeah he was a Heyman guy long ago) Of course the Roof explodes. Paul then stops and thinks, I have 4 now, but where could I find a fifth person, Of course I would call this guy, he is a mutli time champions and a bad ass....The classic Glass breaks it is Stone Cold steve austin.
(My show my rules, Vince's money) This allows the mass selling of the PPV (also note we just upped the price of the network) ( a 10 man tag, allows SCSA to do little work , but allows the use of the name.) (Bully Ray is a second choice is WWE is building on the Taker vs Lesnar match at a later date.
Wyatt's team split into to Harper and Bray head in after Lesnar after a suplex or 3 to the Harper catches Lesnar with a boot and takes him down. But of course Heyman team takes over and clears the ring.
Bo Dallas is eliminated First, and the Usos follow both beat by a new meaners Curtis Axel. Lesnar takes Axel to Suplex city and leaves him broken in the ring. Sheamus gets in and goes to work heavy on Lesnar legitly bringing the power to Lesnar and putting him down a few times. But in Lesnar like Fashion he turns it up quick and Suplex of 4 then a F5 ends Sheamus' time.
Bray Wyatt comes into the Ring, the Undertaker makes the blind tag pissing off Lesnar, Who jumps down off the apron talking with Heyman, Heyman is trying to calm him down as Undertaker is making Bray take a beating. Undertaker is whipped into the ropes Lesnar makes a blind tag. But Sheamus attacks him outside the ring with the MITB briefcase, over and over again, Until he stops moving. as they say "All hell breaks loose" Axel and dallas return to the ring to assist but are met with Stunners. Lesnar is rolled into the Ring by Sheamus as he stands Luke Gets him with the Boot and covers for the Pin (this locks his win over Lesnar) Undertaker and SCSA take out the Remaining Wyatts to get the win.
Later that evening Reigns vs Rollins go to hell and back beating on each other, the match involves J&J and Ambrose eventually all three are gone. Reigns and Rollins continue to go at it, as Sheamus comes to the Ring with his Referee and MITB briefcase, but he is in street clothes, not looking for fight anymore tonight. he sits with the announcers and speaks about debating cashing in or not. Reigns begins to get the upper hand but in WWE fashion the ref is knocked down, Sheamus' referee goes to get in the ring and he is grabbed, and Sheamus say you are mine let them get their own.
Reigns has a good 10 count before he gets up and look around, he see the Referee and beckons for him to go in, he moves forward and Sheamus grabs him. Reigns comes out the ring and confronts Sheamus who hits him in the head with the Briefcase 3-4 times and rolls Reigns back in the ring and puts rollins on top of Reigns, then Allows his referee to count. Kick out at 2, leaving Sheamus, Rollins, Fans, Announcers, and the Referee in shock.
Rollins is setting up the pedigree, When Sheamus stops him and places the MITB case under the spot where Reigns will land, and backs up. He signals the announcer and we hear "Sheamus is now part of this championship match". Rollins locks eyes, but is holding Reigns in the pedigree. Brough Kick to Rollins and Your new Champion SHEAMUS the Confetti falls and Brock Lesnars music hits. Sheamus get the hell out of dodge.
Over the next Few Months, Bray Wyatt stocks Lesnar and Heyman as Sheamus is being chased down by Reigns, Rollins and Lesnar all wanting a Shot.
December PPV has a Fatal Four way match between Reigns, Rollins, Lesnar and Sheamus. ( I know I went Off, But since It has to be vs Lesnar for the world title, I need to build that too)
Towards the end of the Match Lesnar is controlling the pace and looks to pin Sheamus for the title, when the Wyatts return (all three) They go after Lesnar and help Sheamus retain the title via a rogue Big boot from Harper, as payment for Survivor Series.
Royal Rumble. Lesnar finally get a clean Cage match vs Sheamus and wins the WWE title.
During the Rumble, The Wyatts come in 25 (Rowan) 27 (Harper) 29 (Bray), Rowan is eliminated by Reigns and Ambrose, Ambrose goes first by a big boot from Harper. Leaving Bray, Harper and Reigns ( we can build this beatings received by Wyatts deep and let Reigns recover until Rowan comes down and pulls Reigns out over the top. ( yes, I think screwing over a wrestler over and over builds to that moment when they win their first title) Bray and Harper stare at each other and Harper walks towards the ropes to step out and allow Bray to Win and get a shot at Lesnar for Wrestlemania. When Lesnar's music hits, security and Refs stand in his way and like a bulldozer plows through them, he hits the ring and Suplex's harper through the ropes and goes UFC on Bray Wyatt. In the air prepped for an F5 Harper rolls back in the ring and hits the big boot, Lensar Stumbles backwards but never drops Bray. Lesnar hits the Ropes and a second Big botos dumps Lesnar and Bray. Harper Wins the Rumble and will headline Wrestlemania. Harper looks horrified Bray lost and a little upset.
On Raw they mend the fences and Harper begins to Mock Lesnar Saying three times he has destroyed Lesnar with the Big boot.
The family avoids Lesnar and taking cheap shots when they have a chance, Leading to a Interference laced Title match by the Wyatts and the 3 on 1 is too much for Lesnar (barely) and Harper wins the World title.