Unpopular opinion: The fandom (and then later Riordan) keeps forgetting Thalia is not a punk rock young adult. Thalia is actually a 15 year old with the mentality of tops a 13 year old.
Thalia became a tree when she was 12, while Riordan try to pass the whole thing as “her body grew up” and “she looks like 15” it wouldn’t really fully since her brain didn’t mature: hence why she is acting like an immature 13 years old that she is. Thalia went back to being 12 years old mentally and become an inmortal 6 months later, her brain couldn’t have developed that much in those 6 months.
At the end of TLO when Percy turns down inmortality he says he doesn’t want to be stuck at 16 forever, it’s heavily implied he would never mature or change. So Thalia, who is now an immortal, is stuck in the same way 15 year old body with an inmature brain: proved by the way most hunters (that are canonically 10-14 in TTC with the oldest being Zoe) act in the first series
And you can see it the way they act, they are inmature girls, some of them barely teenagers, most of them not even being teens and they have been stuck like that for centuries. They don’t grow, they don’t mature, they don’t anything. So there is no way Thalia is the mature punk ass young adult every want her to be.
Then we have my next issue: The vibe of the Hunters feels so different in Heroes of Olympus and The Trials of Apollo (please have in mind I have not read the latest book of TOA and I’m writing from what I have seen online):
The hunters don’t longer feel the group of little girls they are (avarenge age is 12-13 since that how Artemis look like) instead it feels like a bunch of group of 16-20 years old. I have seen posts sexualizing the Hunters when it feels so wrong because canonically they are 10-14 years old.
Everybody (Riordan included) seems to forget about the inmature girls we met in TTC. These girls don’t grew up, these girls don’t mature. This girls are no older than 14 (15 with Thalia but really she is 13) and why Reyna joining them is...weird.
Reyna could have easily join her sister with the amazons. Not being the only 16/17 in a group little girl. And this is why I also don’t feel comfortable shipping any of the hunters, Thalia included. They are little girls.