"Weak people cannot be sincere." -Francois De La Rochefoucald
Mimi comes off as a rather shallow and selfish sort of person, who judges by appearances, whines a lot, and wants nothing more than to go home. Although she is kind-hearted right from the start, she's not afraid to insult or snap at people and tends to consider herself and her needs more important than the others.
She also says a lot of ditzy or spoiled things.
"Oh, I do like the way our colours match!" (In response to Palmon digivolving.)
"Nice hair, good colour!" (In response to Patamon digivolving.)
Palmon: We have to do this!
"Oh, I would just love to take (a Yokomon) home and put it on my bed with my other stuffed animals!"
"I don't do this much walking unless I'm at the mall, and as you can see, we're nowhere near one!"
"Palmon, I've been meaning to ask you, who does your hair?"
"If I won't walk in dirt, what makes you think I'll sleep in it?!"
"Oh well, they always were kind of weird..."
Mimi doesn't seem to respect the others very much, although she is usually forced to go along with them. Her opinions don't have a lot of sway in the group. Nobody fusses over her like she is used to, and so she often feels rather out of sorts. Sora says that Mimi is so stubborn that nobody can reason with her. ^_^;
Seeing herself as a sort of delicate flower, she resents having to rough it, although she later learns the value of being strong. Being cute (and having a big hat), others find her attractive, including some of the most vile and disgusting Digimon... she's abrupt with them and won't give them the time of day, always prioritising her own affairs, accepting their help and then and not really giving them a second thought.
Mimi doesn't bear grudges and tends to 'live in the moment' - she doesn't worry a lot about what's going to happen (although she's afraid to die) and as soon as the situation changes favourably she's all happy and excited, forgetting her previous complaints.
I think that apart from some of her more blatantly stupid comments, such as commenting on fashion when their lives are in danger, Mimi is a pretty realistic character. A stereotype she may be, but I know a number of girls who would probably respond to the digital world in the same way.
I remember one scene, where everyone is going into a sewer, and Mimi's standing there trying to bring herself to jump in (everyone else is in), saying "okay, I can do this, I can do this..." and finally forces herself to jump. Tai mutters that it only took ten minutes... She also has difficulty mustering up the courage to get off Whamon, while everyone else is already waiting for her. (He then 'helps' her off, and she falls right on Izzy, hahahaha.)
It must be kind of hard to be the only person like that in the group.
Mimi is less fearful, whiny and selfish than she used to be. She refused to give up when the odds were against her and she thought that Myotismon would rule the world, and voluntarily returned to the digital world, when she would have been much more comfortable at home. She once says that she is trying to be less selfish.
Mimi is hit hard by the deaths of their Digimon friends. She would rather do nothing than have others die on their behalf. She ends up splitting up from the others, and Joe goes with her. Mimi feels bad about her decision, but knows that she couldn't bear to fight if it ended with their friends hurt.
They meet Ogremon, who is injured, and Mimi helps him. She insists on it, although the others are (rightfully) nervous of the evil Digimon who attacked them so ruthlessly earlier in the series. But she says that kindness should extend to everyone, and he ends up travelling with them.
It is the death of one of Mimi's best Digimon friends, Leomon, that convinces her to go on fighting. She realises that Digimon will die if she doesn't do anything, and that it is important to defeat the Dark Masters if there is to ever be peace and safety. She hopes that Leomon and the others will be reborn some day.
After that, Mimi and Joe travel around recruiting Digimon friends to help them in their fight. There is more than one way to fight a battle. You can tell that Mimi likes this way - rounding up friends and support - much better than the way the others have taken. Following love instead of war, helping instead of hurting. The Digimon that Mimi rounds up help the group to fight of a large number of Vilemon, in a situation where numbers rather than simple strength plays a role of importance.
I think Mimi also likes going off apart from the group because Joe-on-his-own listens to her more than the group in general did, and as one of only two digidestined, she gets more say. If she wanted to rest, then the group was happy to rest. She had a few Digimon to help her out with things, such as finding food and preparing it, so all she had to do was to travel, and help Palmon to digivolve.
She was the last to rejoin the digidestined in their battle against Piedmon, and so completely avoided all the disaster and terror involved in that. Lucky for her, I am not sure that she could have coped.
Mimi is assertive as she was in the first half, and can still be a little spoiled, but she is easier to get along with, more caring and sensitive to others' feelings, and seems to feel things at a deeper level.
The style of complaining
(You know this is just an excuse to compare her to Joe, my favourite character. ^_^.)
Her complaints are usually about trivial or material things - such as complaining about having worn the same clothes for too long, or that her hair is being messed up, or that she doesn't want to sit in the dirt, or that she can't sleep with everyone else nearby.
This is in contrast to Joe, the other main complainer, who usually complains about his supposed health problems or more serious issues - such as everyone dying of hypothermia, everyone being killed by monsters, everyone dying of dehydration, etc... ^_^;;
The main complaint the two do have in common is of being tired. But generally, Mimi's whining is usually about immediate problems of the moment - practical and to the point - whereas Joe's whinging is usually a result of his morbid imagination running away with him.