Telluria hurt a lot for me. I got like 4 of him/her/it, and got about two weeks of use before nerfing to oblivion. (Never got Vela until years later, nor Gravemaker, so felt really put upon when I lost my best hero because of the combo).
I'm currently using Eldwren on my purple raid team, but that could easily change with a lucky pull somewhere else. Aurox is doing a good job on my yellow team as well.
I used Roughian and Nurgib a good long time, and Kara. I have Seshat maxed with costume and she occasionally gets play (3 costume PoG challenge, for instance). Kingston was a favorite for some time, but haven't used him in a while. I got Ares and Gravemaker very late to the party, so they seldom get used. Iris was useful for a while, as was Malicna. I keep saying I'm going to finish Chloris, but I have Vernon to finish, followed by Broseph, so it'll be a while.
I had five of the HotM last month and had intended to keep one, but traded them all off for SE.