Her name is above, her nickname is Aanya, she's half Russian half Japanese, and a member of HKT48 / Team H. She's very, very extrovert - quite weird, and has tons of energy (great sprinter for example).
In addition to that side of her, she's also very good on TV, especially considering how young and new she is (HKT48 is very new as group). And I think she's becoming one of HKT48's front girls - which is good - as she's quite enjoyable! :)
http://www.youtube.com/watch?v=2HVOhv-2GYg#t=445s - and a little bit later just after this timeframe, Aanya introduces herself with a few lines of Russian.