Which younger actor has the most promising future?

I'll say Ronan obviously but too many are missing - where's Will Poulter?

I didn't want to make too big of a poll I thought it'd be an eyesore. I cut many before posting this (Letitia Wright, Chloe Moretz, Abigail Breslin, Noah Schnapp etc.) but you're right I definitely should have added Will Poulter to this list

Ronan should not be included imo as I feel she's already pretty established.
I voted for Chalamet, Hailee and Tremblay with HMs to MBB and Elle Fanning.
I don't get all the sudden love for that Stranger Things kid Mike. Kinda found him annoying in IT. Noah is SO much better.

Ronan obviously, Elgort probably and Sheridan hopefully.

I wasn't going for vote for Ronan, as I thought that on the one hand she's a three time Oscar nominee at 23 and arguably the most critically lauded young actress for generations, but on the other had, if you showed her picture to 100 random people, I doubt 20 of them would know who she is. I think she still has a long way to go before she could be considered a movie star, so from that perspective, there is still some room for her to grow career recognition wise.

I'm not sure if Ronan qualifies. I mean, three times Oscar nominee! She's not that known by the public, but she's got enough to get herself in the project she wants, I guess. Fanning is quite the opposite, I guess. She's quite famous and has her followers, but she hasn't had the luck to find herself in a baity film yet.
Lucas Hedges and Timothée Chalamet have great futures ahead. Besides being super talented and charismatic, they have kick-ass agents. Hedges has starred in 3 BP nominees in two years, and Chalamet came from "the kid from Homeland" to Oscar nominee working with many important people.