He doesn't change the recipe that works for him (ODIs), instead he just spices it up a little for this format. You won't see him trying the ramp shots just because he's playing T20s.
His game is based on strike rotation and putting the bad balls away. When he goes out to bat, India usually have a couple of overs of powerplay still to go. He uses that opportunity to get off to a moderately good start playing risk-free cricket and just getting one or two boundaries.
Then come the middle-overs, this is Kohli's bread and butter. His strike-rotating skills are really put on show here. You'll see he's more than happy to take 1s and 2s. Usually in the middle overs, teams bring on their spinners and his release shots against them are the pull over midwicket or the loft to extra cover. Both shots he has absolute command over.
One thing I've noticed is that he's very methodical in the middle-overs. He's content to just get one boundary an over and you can see he sets certain targets for himself within an over. Very rarely will you see him attempt two lofts over extra cover in the same over. Not because he doesn't back himself, but he would much rather not take the risk of charging down the pitch again.
The last 5 overs then become a little bit easier for him because he's then well set and seeing it like a football. He usually brings out everything he has in his arsenal for the last 5 and his abilitiy to pierce the gaps really helps him in this regard. I feel like he considers a single a failure in the last 5. He'll either actively go for the boundary and hit the ball in a gap where 2 is easily available.
That's pretty much all there is to him but it just requires so much skill and dedication. The reason why he's so special in this format is because his skill-set is complete. You have specialist openers that get you off to a flier, players than anchor the innings and then you have your finishers. This guy does a little bit of all 3 which is what makes him comfortably the best T20I batsman out there right now.
He was unlucky last time not to win the T20 WC as he essentially carried that Indian batting line-up but this time I think he'll finish the job.