More Sith, Less Brat
Neither Kylo Ren nor Snoke is a Sith Lord, but they certainly bear some resemblance to the group. Kylo Ren may be into genocide and control, but his other spoiled brat attitude doesn't necessarily fit the Sith mold (unless you count Anakin, of course). When Kylo took off his mask and went into brat-mode, destroying a work station in a hissy fit, it left us scratching our heads - this wasn't the sinister subtlety past Star Wars villains employed.
Making Kylo angsty or angry isn't necessarily a bad thing, but Force wielders on the Dark Side are typically more cold and calculating. In the trailer, we saw him smashing his helmet. We're hoping this is him burying the past and his failures. After all, Starkiller Base fell under his watch, Rey bested him in battle, and to top it off, he got slashed across the face. Johnson has hinted at a darker calm within Kylo, however, which could well be why he extends his hand to Rey in the now iconic trailer. He has already been trying to turn her to his side, and maybe he will finally be successful. This Sith-like behavior would help remedy what Abrams botched.
Spill More Blood
Seeing Kylo ready to kill yet another parent is another big step forward. More so, losing his mask shows he's ready to bear these burdens out in the open and let his enemies see him as the face of fear. Egotistical? Maybe but if he has a greater thirst for blood, then so be it.
Johnson has to show Kylo as ruthless, someone who's not going to take prisoners -- a tactic which clearly didn't work out for him in TFA. We need to see him killing his enemies -- and his subordinates -- mercilessly if we're going to really buy him as evil.
The Force Unleashed
From the trailer for The Last Jedi, Luke made it clear to Rey that he's seen raw power like hers before - he is very likely referring to Kylo. Johnson needs to show us this because so far, Kylo hasn't been all that impressive with the Force. Despite having much more experience than Rey, she beat him in a duel and we also saw her mentally blocking him, even pulling off a Jedi mind trick. Which leaves us asking -- what is Kylo's "special" factor Snoke spoke of?
Johnson has to elaborate on this potential that made Kylo think he could transcend conventional Jedi limits. When Vader went crazy using the Force at the end of Rogue One, fans were stunned because we'd never seen that kind of display onscreen -- at least in live-action. Kyle doesn't need to be the new Vader, but he does need to have his Vader moment.
Arriving Dec. 15, director Rian Johnson’s Star Wars: The Last Jedi stars Mark Hamill, Carrie Fisher, Adam Driver, Daisy Ridley, John Boyega, Oscar Isaac, Andy Serkis, Lupita Nyong’o, Domhnall Gleeson, Anthony Daniels, Gwendoline Christie, Kelly Marie Tran, Laura Dern and Benicio del Toro.