Rashford showed plenty of flair at youth level, and he has experience playing as a right winger, as a #10, and a left winger, not to mention as a striker when he demonstrated his mental fortitude by stepping up to the responsibility when Demetri Mitchell (an explosive winger that was looking a level above the rest) got injured very early in the season. When Rashford invariably had a growth spurt, his playing style was almost unrecognisable, the youthful exuberance was missing as he had to adapt to not having pace as an advantage. His game was so affected by his growth spurt, that he considered becoming a defensive midfielder. Once he adjusted to the changes in his body, he was playing like his normal self.
At senior level, those that were unfamiliar with his exploits at youth level considered him to be a poacher off the basis of his first couple of games or so. I remember him showing elite technical ability against Watford, particularly on the right side (despite being a #9 in the starting berth) which impressed LVG so much, that he started Rashford RW the subsequent game.
Under Mourinho, he wasn't as expressive as he was at youth level, or his breakout season with LVG. That's not to say he didn't have his moments. A notable example being his performance against Anderlecht where he pulled off ; body feint, la croqueta, cruyff turns, rabona, stepover, nutmeg, in such a high stake game which reflected his confidence. Concurrently, he's been very expressive for England with Southgate as manager.
Once Ole arrived, we saw Rashford being incredibly expressive. That stopped from the PSG onwards where his technical ability was deviating to the point where he was getting criticised by the United faithful. And of course this season, he's once again demonstrated the skills in his level. He does have a bag of tricks amongst other areas in his locker. He needs to be more consistent in his technique though. The times when he runs the ball out of play should be anomalies, and its fair to say that has been the case this season. In the 2-0 defeat to West Ham this season, he was through on goal and he left the ball behind. Things like that shouldn't be happening to a player with high technical ability. Although Mbappe unequivocally has greater technique, even he had shocking moments of technique where he looked like
Agbonlahor at times against us ... making him a laughing stock in the process.
Rashford has many things in his arsenal, dribbling, flair, the capability to combine shoot with reasonable power and accuracy with minimum backlift, free kicks, shots from distance, crossing, off the ball movement etc. One area I'd like to see him improve further is his passing/playing with his head up. This was particularly an issue when playing alongside Lukaku, as on multiple occasions he lacked the awareness to see the striker was in a much better position, and instead dribbled with his head down.
Great pass from Rashford to Vardy. With Rashford's athleticism, opponents are going to back off him, so if he could use that to making probing passes that will make him unplayable.
Somewhat similar with Greenwood, there are some people that think he's a poacher. As he gets more acclimatised to the rigours of the EPL, we'll see more cases where he has a greater influence on the overall game, as opposed to being a peripheral figure.