1. I love to see how characters deal with adversity. What do they say when they can't just quip their way out of a situation. What if there's no clear solution? What if it's a no-win scenario? What are they made of?
No-win scenarios can really peel away layers of a character and reveal so much. I thought "Similitude" did a great job with that.
2. I love to see how characters face death. Do they go kicking and screaming? Do they accept it as a natural and necessary event?
Eons ago, I went to a seminar on
Star Trek II, and one of the speakers was screenwriter Jack Sowards. He said that his original version of the scene where Spock is in Engineering saving the ship, was much more subdued-- Spock quietly and efficiently pushing buttons and adjusting controls, as the radiation slowly overcame him. But somebody wanted more pizazz and heroics, so the final version of the scene was all that billowing smoke and flashing lights, Spock staggering around opening ducts, etc. Everybody at the seminar preferred Soward's original version, how logically Spock approached his impending doom. So even the setting can have an affect our perception (or the screenwriter's

) of how a character faces death.
In the same film, the way Kirk comes to realize, and confess, that he has cheated and tricked his way out of death for so long-- seeing him fight and struggle against that reality before bleakly acknowledging it-- was something I didn't realize I'd been waiting for. It's so seldom that a leading character
really does face death-- not just face it long enough to get past the commercial break.
And the Kirk/Spock death scene... beautifully done.
3. I love to see how other characters react when the hero is hurt. What facades do they drop when it gets right down to it? I liked McCoy best when he wasn't cruelly teasing Spock, but was rather caring for him through his injuries. How does the relationship grow because of it?
My favorite "character" in TOS is the McCoy-Spock dynamic, and a couple of favorite episodes are "Bread and Circuses" and "The Empath," because the characters are (fleetingly) vulnerable and honest about their friendship. The scene in
Star Trek III where McCoy talks with the unconscious Spock, saying he doesn't want to lose him again... marvelous stuff.
One of my all-time favorite episode of any show, ever, is a fifth season Emergency!, where my favorite paramedic character is bitten by a rattlesnake and has to treat himself on the way to the hospital. The person most worried about him is his archenemy. I still remember that episode from the first time I saw it, sometime around 1975. (Yes, kiddoes, I'm that old.)
I loved that one too! Gage lying atop the fire engine en route to the hospital, phoning in his vitals and symptoms as he starts to black out... gold, just gold. Mantooth was a dreamboat, LOL. We are definitely TV geeks.
To HR, when I said I like to see characters tortured and then wrote "not literally." I meant it! That's pretty blech.
Oh sure, I know it was figurative. But there
are Trek torture episodes, and there's "hurt-comfort" in fanfiction. So there's an audience. Personally, I rand out of the room during those scenes in "Syriana" and the first Craig Bond film (ouch, ouch, OUCH), I'm squeamish that way.
On ENT, I also enjoy episodes in which T'Pol suffers and struggles with her emotions...
I'm one of those who found the trellium storyline very compelling, because of T'Pol's struggle. It had some Spock to it, the battle between control and emotion. Blalock has said in interviews that she didn't like having her character go through that, but I thought she did a terrific job. I wish the post-trellium aftermath had been explored more in Season 4, but the show had too much else to worry about, I think.