When I first sketched out my posts for this (to make sure I could do most of them) my initial selection was Karla The Grey Witch from the Record of Lodoss Wars OAVs.
This was a character who was alternately helping both sides. It took a while to find out why: she (Fbzrgvzrf...vg punatrf bppnfvbanyyl) is seeking to avoid the heartache and grief caused when empires fall by preventing them from rising in the first place (such is the course of empire).
Karla was, and is, a sophisticated implementation of a True Neutral/Balance Seeking character that also makes some subtle political points (that the protagonists reject but they still left me with things to think about).
But in the end Karla is also a well understood character: her motivations are clear and, to a point, sympathetic.
So I needed another character who is, and remains, ambiguous and mysterious. That gets a bit tougher, particularly when you consider how many anime tend to reveal all at the end in one way or another.
In the end I'm going for Reki from Haibane Renmei. This is a character seeking to overcome some seriously nasty unfinished business...only we never find out exactly what it was. In fact all of the older Haibane are souls with unfinished business given that they are named for dreams that they had*.
But beyond a dream that they may or may not remember clearly, none of the Haibane remember what that business might be. Oh I can make some reasonably good guesses, particularly for Rakka, Nemu, and Reki but guesses are all they are.
Reki eventually overcomes it with Rakka's help by becoming the mask she chose for herself but never finds out what it was, or why that was the way out.
So in the end ambiguity is central to the Haibane and it never goes away, even with the drama surrounding Reki's inner turmoil.
*Aside: The younger feathers are named for dreams that they have which makes me wonder if they represent unfinished souls instead.
Day 1 - Very first anime: Robotech, Gall Force, Vampire Princess Miyu
Day 2 - Favourite TV series: Card Captor Sakura
Day 3 - Your anime crush: Oh grow UP already.
Day 4 - Favourite Film: My Neighbour Totoro
Day 5 - Anime character you feel you are most like (or wish you were): Kinoshita (Rocket Girls)
Day 6 - Most annoying anime character: Lynn Minmei
Day 7 - Character you’d most like to slap: Hiyama Hikaru
Day 8 - Most epic scene ever: Launch day - Wings of Honneamise
Day 9 - Saddest anime scene: The passing of the Fortune Twins - Nariya and Eriya
Day 10 - Favourite slice of life anime: ARIA
Day 11 - Favourite mecha series: Patlabor: The Mobile Police
Day 12 - Best instalment of a franchise you don’t like: Mobile Suit Gundam 0080: The War In The Pocket
Day 13 - Worst instalment of a franchise you do like: WXIII: Patlabor the Movie 3
Day 14 - Current (or most recent) anime wallpaper: I think I had a Silent Mobius wallpaper once.
Day 15 - A reality check for a genre you like: Romantic/Heroic Space Pirates
Day 16 - An anime classic that simply doesn’t work for you: Ghost in the Shell (film)
Day 17 - Best Background Music: Silent Mobius 2: The Motion Picture
Day 18 - Best Five-team: Silent Mobius
Day 19 - Change you’d like to make to any one anime: Add an animation budget to Lodoss Wars
Day 20 - Most ambiguous anime character: Reki, Haibane Renmei
Day 21 – Favourite OAV Series
Day 22 - Animation studio you'd most like to slap.
Day 23 - Anime you think had the best, or most intriguing art
Day 24 - Favorite anime hero or heroine
Day 25 - Best anime villain
Day 26 - Your favorite harem anime
Day 27 - Favorite anime opening theme song
Day 28 - Favorite anime companion/summoned creature
Day 29 - Best Anime Music Video
Day 30 - Favorite anime ending theme