Basara - in a way... she's not really naive... but she does make huge impacts on people by just reaching for her goals, and giving her all.
Skip Beat - really funny, and cute!
Ouran Koukou Host Bu - I wouldn't say she influences people like Honda-san did but, she does always bring in a ray of light to people in the dark ^^
Hana Yori Dango she changes the menacing F4 into well something not so menacing! I love this series!
Gakuen Alice She definitely influenced the people around her! This is a really big recc. for Fruits basket! And please DO NOT be fooled this is no kiddy manga! It's deep and it goes the same way as Fruits Basket, light hearted in the beginning all comedy and hints of drama then BAM drama, lol, either way this is really good for Fruits Basket Lovers
Kare Kano it starts out simple and easy but then gets very deep and into it! It's really good!
Spoiler (mouse over to view)
The main girls presence causes good things to happen to her lover! Though it takes a while to see how, that's part of the good amazing mystery! Hehe :p
Hope I helped!!
________________
`~Yo~`