Aoba is the Best Girl of 2010 even though
Adachi Mitsuru can only draw one face.
Congratulations to Tsukishima Aoba, 2010's Best Girl. This was a pretty easy choice despite a lot of strong contenders. More about Aoba herself and the rest of this year's nominations below.
Shimizu sees Goro again after a long absence.
Shimizu Kaoru from the sixth season of Major got an automatic nomination by virtue of being last year's winner. Unfortunately, Shimizu did not get many scenes during this epic baseball show's final season, and had many of her presumably more important moments from the manga relegated to the montage during the last episode. I suspect Major probably has enough material for a seventh season, but I don't think we'll get any more in anime form unless there are OVAs.
This usually means somebody's about to get fucked.
I've decided to add Mouri Ran to basically every Best Girl of the Year list from here on out on general principle because Ran is one of anime's All Time Babes. Detective Conan doesn't change much and appears capable of running indefinitely, and Ran is enough of a sweetheart that she could potentially win this contest any year, so consider her a baseline metric of sorts. Certainly anyone below the Mouri Ran Line has no hope of winning.
Katja breaks Sasha's brain.
Only people who watched Seikon no Qwaser will fully understand why Katja gets a nomination. Too many people either did not watch the show at all or gave up on it far too early to fully appreciate just how ridiculous Qwaser managed to be. Katja's contributions are too numerous to list here, but I'll point to three key moments that cemented her nomination in 2010's Best Girl competition: (1) The scene where she connects her phone to her television. (2) The railgun powered by breast milk. (3) The scene where incorruptibly loyal Hana comes flying in out of left field.
Yamada is basically Ranpha, the early years.
Yamada from B Gata H Kei barely makes the list for being outrageous (only medium outrageous in a year containing Seikon no Qwaser) and for being an excuse for Yukarin to say amazing things.
Be glad this isn't a Key story, Yuki.
Nagato Yuki qualifies this year because of the Disappearance of Haruhi Suzumiya movie. As I've said before, this is more her movie than Haruhi's. Now, in order to answer the obvious question that people who have seen the movie must be asking without venturing into spoiler territory before those who have not seen it, let me just say this: Based on how Kyon views Nagato in the beginning of the film, the middle, and the at the end, I think the impact she has on him (and hopefully the viewer) elevates her into the upper pantheon of this year's nominees.
Squids love the long ball.
A late arrival, especially because I did not start watching Shinryaku! Ika Musume until it was already half over, Ika Musume herself easily gains a nomination as one of 2010's Best Girls. A genius at everything (except invading) and filled with verve and imagination, Ika Musume should be on everyone's list of this season's Best Girls. Well, I guess there is that technicality about whether or not squids can be girls, but I consulted the judges panel and they allowed it.
Nobody on the team trains harder than Aoba.
Finally, our victor, Tsukishima Aoba from Cross Game wins the title of Best Girl of the Year for 2010 with her solid showing throughout the yearlong baseball anime. Aoba nearly won the title last year, and was an early favorite to win even though Cross Game ended in March.
The best coaches are in the stands.
-Charles M. Schulz
It's easy to describe Aoba as another Haruka Tomatosauce tsundere, but I believe Aoba honestly hated Kou when they were children—jealous of the attention he got from her sister. However, Aoba grudgingly comes to respect Kou's physical talents for baseball and dedicates her considerable knowledge and love for the game into transforming him into the type of pitcher who can make her sister's dream come true. My memory is very hazy on this point, so the accuracy of the following anecdote is suspect at best: I believe Don Drysdale once lamented it was a shame the Los Angeles Dodgers did not have a pitcher with Orel Hershiser's brain in Kevin Gross' body. That's basically the idea behind the Aoba + Kou combination in Cross Game. It's a pity Adachi Mitsuru could not re-write the rules of Japanese high school baseball, but Aoba's head—and her heart—were enough for her to win it all this year, even if her arm could not officially compete.
That's still an awesome phone.
If you're wondering why Shikinami Asuka Langley didn't win by default, it's because Rebuild of Evangelion 2.0 came out in 2009. Also Soryu > Shikinami.
[Update: Added Panty from Panty & Stocking with Garterbelt.]