On a surface note, I look at Midna and Zelda as a yin and yang type relationship. One is not complete without the other, and they are truly two sides to one coin. Midna was a fully dynamic character (i.e. experienced character change, emotional change, and came to new conclusions) and we watched her develop into a caring, benevolent ruler that would eventually do her country justice.
Zelda on the other hand - we don't get as much about her. We have to take away from her brief screen moments as much as we can, and surprisingly, it's what is NOT said about her or what we DON'T see that speaks most strongly about what a solid person she is.
For instance, Zelda tells us what all took place when Zant arrived to take control of her kingdom. She does NOT tell us what she was going through emotionally at the time. Do you know what it takes to hand over a kingdom that has been in your family and been in your care for thousands of years? Zelda is virtually handing over her life when she surrenders to Zant - an act in and of itself that would take incredible mental power. Not only that, she is handing over her financial security. No doubt Zant raided the royal coffers as soon as he could find them, so Zelda has no way to feed herself or pay soldiers to keep her safe once the little money she has runs out. Also, Zelda could have stood and fought when Zant came for her surrender, but likely she would have lost her own life in the process and made Zant that much more unmerciful to her subjects after her death.
So, so far we have: extreme mental strength and logical thinking processes on Zelda's side.
Next up, we have her imprisonment in her own bedroom. It sounds a little cliche that she is "trapped in the highest tower of the highest part of the castle," but remember that the Zelda series is a big, fat fairytale. :D It is here that we see the possibility of Zelda's first
negative character trait: self-indulgent angst. I mean, she is wrapped up in a black cloak that covers her whole head and she has wrapped her face up in a dark purple scarf. Maybe it was drafty and cold in the room, but if her clothes aren't a slight indication towards some self-pity, then we can take note of the fact that she is staring out her window at the rain when Midna and Link first arrive to see her.
Now to be fair, I haven't gone through what she went through. Zelda may have not eaten in a few days the time Midna and Link found her - I'm sure Zant looked at her as a kind of POW. Being hungry, I know, seems to make situations worse for a lot of people. But still, she controls her temper and emotions when she speaks to Link about the incidence and she even manages to look beyond her immediate situation to see that Link was at one point cruelly imprisoned. "I'm sorry," she says, and I imagine that if she had been in a little better mood that she would have given his leg a kiss.
I don't think I need to go back over the "death scene" in the middle of the game to say that she had an attitude of self-sacrifice. Before Midna and Link came back needing her help, she might have had a feeling that things were starting to look up, and when she saw that Midna was in the shape she was, she saw that something had to be done immediately or the "yin and yang relationship" would have been disturbed.
(Now here, it is my personal opinion that Zelda's body did indeed die when she handed her spirit over to Midna. My evidence is that when Link and Midna arrive in the throne room that Ganondorf occupies we see Zelda hanging above the throne. Her body is waving slightly from the air circulation in the room, but it is obvious that her body is
NOT breathing. Zelda's spirit stands inside Midna's, and consequently, this means that the "yin and yang balance" has not been disturbed because Zelda's spirit has not "died and gone to heaven.")
All that aside! :D Zelda demonstrates deep self-sacrifice - that the grand scheme of life is bigger than she is, even though she is a full-blooded, ruling Royal.
We are also aware that she is probably pretty handy at the sword, and we know for sure that she is handy with the bow and arrow. I know, I know - she used Link's targeting for that, but in real life, she wouldn't have, so play along! Zelda was obviously an excellent sharpshooter and she wasn't going to let a piggish madman stop her from getting everything that had been taken from her back. It would have been dangerous, obviously. Link can get knocked off Epona and get injured, and in reality, the same could easily have happened to Zelda. And does she shirk her duty? I don't think so?
And finally, we come to the scene where she asks for Link's help in the middle of the shining lake. She demonstrates her courage again here by asking - she doesn't demand it "by Royal order." In fact, Zelda
bows to Link to show that she is ready for a "yes" or "no" answer. That's big!
Okay, so to sum up: we have - extreme mental strength, good use of logic skills, rein on her temper and emotions, self-sacrificial willpower, the ability to see that she is not the most important person on the planet, sharpshooting power, humbleness and, of course, Wisdom. She is also aware that she must hold up her end of the "yin and yang relationship" between she and Midna.
Zelda may not have been fleshed out as much as we would have liked in TP, but what we take away from what we do not see and we do not hear is overwhelming.