Sooo I think this is fairly straightforward? How have your characters changed over time/how have you changed them? You can pick up to three, as this is a pretty open-ended question.

I only completely revamp when I've let a character gather dust for a long time and they become boring and static to me but I still like some aspect of them/some role they fill... otherwise, my characters change through plot and me changing things when I get more experienced/when my interests shift. And just adding more depth to them over time, I guess. My characters aren't really roleplay oriented. lD

Most of my characters are RPed quite frequently and change that way, and their plots are connected to RP, so both plot and RP play a factor in character development. c:

Saying this, I do have some characters that are more static than others, despite the RP. |D

I've only done about three or so COMPLETE character revamps, and that's because I just don't feel very attached to their character, if at all anymore. That or I feel as if there's nothing I can do with them. (ex. Atauri. She used to be a shy little artist. Not fun to RP because she barely talked at all. Nor fun to draw because her design wasn't too colorful either, mainly gray with dull clothing. Gave her a complete revamp- now she's a sketch artist for the FBI who'd much rather be a forensic scientist or a field agent. And she loves bright colors and rainbows so that reflects in her clothing. PROBLEM OF DULL BORING CHARACTER SOLVED YEY)

I don't RP at all, first off, not counting crack stuff that I don't count as canon and the weird little things I'd do with Speck to work out Grav + Teke's relationship

That being said, I am constantly messing with my characters. All the time. I have quite a few characters who have gone through so much change that they no longer resemble their original forms in any way. It's usually a somewhat gradual thing; I'll tweak a few things in little bursts of inspiration, but it's only after I have a few of these that the character really changes.

this one (o o)d
my characters change generally over time as i just... try to make them better xD
like give them more flaws, make them more realistic, figure out details of their past

it's weird if you look at my characters now and my characters from two years ago, it looks like i have completely new set... but nearly all of them grew out of old characters... xD

Some characters of mine go through a lot of major revamps (seriously, sometimes I get this lightning bolt of inspiration and I feel the need to change them completely - design, personality, etc.) and others are pretty much constant and will, at most, be tweaked from time to time.

Well, for my anthro plot, the characters are kind of "frozen in time"-- they all have backstories (some more developed than others), and possibly hints of a future, but they have a specific age that they get "frozen" at to simplify my keeping track of the plot-- with that many characters, it's just too much of a hassle to design them/map out their interactions/etc. at every point of their lives. (Especially since my anthro plot is kind of a just-for-fun plot, for my own entertainment and stress relief. I don't particularly need it to make perfect sense.)

HOWEVER, my characters do change over time as ideas strike me and i become more experienced at character design and development. I build on them and revamp them over time to keep them consistent with the rest of the plot. For example, originally I decided whether a character was anthro or quad purely as a function of my mood, but I've solidified the "anthro or quad" logic in my plot-world more, recently-- quad characters fill a somewhat more primitive role and are usually either non-speaking animals OR supernatural beings. There are some characters who blur the boundaries, but as a general rule, a character who attends school or holds a human-like job is going to be anthro. Therefore, characters such as Eirio, Lupio, and Scooty (who were until recently quad) make more sense as anthro characters, whereas supernatural characters (Babylon, Aly, Rivie/Torren, etc.) and more animalistic characters (Pia, Graarg, Miashi...) make more sense as quad.

Plus, of course, I add to my characters plots as I see fit. I'm forever tacking new aspects onto old characters who need further development. For instance, I not too long ago concluded that Maho is into theater, changed Pulse's focus from "deaf raver" to "fashion designer" (though she was and still is both-- only the focal point changed), and tied Eirio in with my brother's character Cholco. Changes (as in taking something away or replacing it) are less common, since I have to justify taking away something that was previously part of that character, but they do happen when necessary (i.e. switching to anthro, changing species, altering timelines, etc.)

My human plot is a little less static, and my characters have their own timelines/lifespans that they grow and change through, but they also (like my anthro plot) evolve as I get ideas and gain character-developing exprerience~

Guess Im the only one....

They constantly shift with no stable design.

When I first started I never gave my pets characters. Now all of my permanent pets do. Yet Pcellia, is my first pet who is actually going through a character change. She was an Amazon Princess yet I am about to upload her new layout and petlookup and she shall be a Warlord just for kicks and giggles ha.

I don't like to consider RPing as part of my characters development, since the ones I have RPed (mainly Roxie/Danela) act so ridiculously out-of-character in RPs than they do in-canon. Roxie was a whiner who had the self-esteem of a suicidal anorexic in RPs, wheras she was a tough deadpan snarker whenever I wrote her.

My characters usually graudually shift due to getting better at designing characters. All my character concepts start out incredibly horrible and unoriginal(Derien the Demon basically ended up existing thanks to Duke Devlin in Yugioh Abridged), and eventually I'll find a spot that I can throw in a twist and change, and eventually, they'll turn into something totally different and (hopefully!) unique. Leuce is my best example of this, he went from being pervy Dan Phantom spawn to vampire that looked suspiciously like Daniel Dark to orphaned vampire-ghost with an evil father out to kill him to vampire-ghost destined to bring an end to an elf's puppet regime because he just so happened to turn a vampire-ghost.

Sometmes, though, my influences will dictate things--my poor copycat Edwin was a hopeless Edward wannabe until I started watching Dexter--and then he became a homicidal maniac sparkly vampire! Much better imo.

Uh, if I'm not content with a character any more I tend to do big massive changes and completely redo them. Though Talo does change through RP, but I kind of already have where she's going planned out so in my mind she's not really changing.

Some characters change when I realize what a crap job I did designing them.
Some characters change when their personality conficts with themselves.
And some characters just change over time.

ta-da~

Over time, I add more depth to them and other stuff that just comes to me.

^This for the most-part. As time passes I sometimes tend to add more personality flaws or positives to my characters, likes/dislikes, etc.

I don't do complete revamps. Once I have an idea, no matter how vague, I pretty much stick to it. While some minor things may change, what really happens is that I might get new inspiration or ideas I may want to incorporate into the character. So I use some wacky Hika-magic and mix the old with the new.

So tempted to pick, -they don't-
Because honestly I'm one of the few people I know who on making a character, as soon as I get the final conception down, I just stick with it. OTL.
(as to why I have such boring characters XD. They have always had the same goals, jobs, and personalities.)
However, at the same time, they do change slightly, like when writing their plot, I'll think, 'no it would be more interesting if...'
or I tack on bits and peices to give them more depth and dimension. I've never really done a complete revamp on a character whose personality I can still remember...

I have revamped my OCs (characters; im used to dA slightly) when they don't work out. Lozengea was once a rebellious pop star and now she's completely different to what I originally had in mind in 2006 xD
I also gradually change their backgrounds. Shintina is an example; she always had a similar backstory but now it's just.. more extreme XD;
Tinah also went from being quadruped to biped for two reasons. One was because I draw humans better than animals and two because Grundia was about 3 times the size of her at the time... lol
Yet, I have OCs that have stayed pretty much the same. Grundia only had his colours bleached and grew his hair gradually since 2007 :B and perhaps became more family-minded. it's still very different from when I first came up with him 5 years ago.

I think I voted for the 3 most popular choices right now.