It's kind of unfortunate that the only bit of characterization for original! Elias that's widely talked about is him being a stoner. It's true that for a long time that's literally the only thing we got. One funny throwaway line. But we do learn a bit more in mag 193 (one of my favorite s5 episodes incidentally) and it makes him a much more interesting and tragic character.
Elias was an aimless rich kid trying and failing to live up to his father's high expectations for him. He was raised to believe that he deserved success and power simply because of the family he was born into. It's implied that this alienated him from his peers leaving him incredibly isolated. It probably also meant he didn't have a lot of control over his own life, following the path he was expected to rather than what he acctually wanted. Even before being marked by the Eye he probably felt like was constantly watched and judged, and found wanting.
The statement draw heavy parallels between original! Elias and Jon. In fact the line between them gets very blurred as Jon "plays" Elias in the statement and Elias's VA plays Jonah in the body of James Wright. Jon and Elias are both parallels and opposites. They were both marked and drawn to the Institute by that mark.
Elias had the conviction that he was destined to be important and he was right the most perverse, twisted way possible. He was only ever there to be used and used completely. To the point were he ceased to be, leaving only his body to puppeted by Jonah.
Jon had no such conviction, and yet he became literally the most import person in the world. But that was only after being moulded and completely reshaped by Jonah. He in a way lost almost as much autonomy and control of his body as Elias did. Though he at least got to keep his mind, for the most part.
This has gotten away from me a bit, but the point remains. Elias, like a lot of TMA characters, is a fascinating person who we only get to see brief snatches of. I think about him a lot. I especially think about how horrifying it must have been to realize, for the briefest moment, that his mind and body were being completely taken over, right before his consciousness was snuffed out.