Aoyama Motoko is one of my favourite anime characters!!! Although I have never much cared for such 'fanservice' as you mention.
One of these days I must learn to do a Zanmaken ni-no-tachi.
In a way it's the ultimate aikido technique, destroying only the evil.
Other than that I'd hardly call Motoko a budoka, much less a samurai. She may have extreme sword-skills, but while her fanclub (those three girls, I forget their names) is always going on about her inner-calm, in truth I think she's way too easily excited, and nearly always overreacts. But then again, that's the purpose of her character!