As
Hunter-san said, Oro's with a boy's body, not a girl's. As said by the Sound nins, Oro's with the body of a boy named Kimimaro.
About
Dopeskilss-san questions:
1- Like
ahhsin said, Oro just have to concentrate Chakra in that area. The same as the Rasengan and the Chidori. Concentrating and transforming huge amounts of Chakra in places like your feet or your hands don't require seals to use.
2- No, that's not it. You don't have to cast seals to use the Chidori, the Rasengan or hand/feet-based jutsu. Just concentrate your Chakra in that body's area.
3- He'll be stuck with that person's Chakra, since the Inner Coils System is part of the organic body, and not part of the soul. Oro can transfer his soul, but he can't transfer his body conditions.
4- Yes, Oro would pretty much be able to beat Itachi. Actually, it isn't safe to say Itachi's stronger than Oro even now. Since Oro bases strenght in the number of jutsu you know, he considers Itachi stronger than him- in other words, he's insecure about his strenght cause Itachi has countless jutsu due the Mange Sharingan. Anyways, I'm not saying Oro's stronger than Itachi, nor that Itachi's stronger than Oro. Just that it's wrong to say Itachi's stronger than him when Oro bases strenght in different and wrong ways (how many times have I said this already?
). But, with the Sharingan, Oro would overcome his insecureness and probably try to fight Itachi.
YOSH! Gotta read some 20th Century Boys now. Man, it's so cool! No wonder they're comparing its story even to
AKIRA.