I can ont say i have just one favorite, so will list some of them:
1. Kotomi Ichinose(Clannad)
2. Fuko Ibuki(Clannad)
3. Nagisa Furukawa(Clannad)
4. Tomoya Okasaki(Clannad)
5. Tsusaka Hiigari(Lucky Star)
6. Kagami Hiigari(Lucky Star)
7. Konata Izumi(Lucky Star)
8. Yui(Angel Beats)
9. Yuipee; Yuri(Angel Beats)
10. Kanade(Angel Beats)
11. Iwasawa(Angel Beats)
12. LeLouch(Code Geass: LeLouch of the Rebellion)
13. Karin Maaka(Chibi Vampire)
14. Negi Springfield(Negima?!: Magister Negi Magi)
15. Asuna Kagurazaka(Negima?!: Magister Negi Magi)
16. Madoka Kaname(Puella Magi Madoka Magica)
17. Kyoko(Puella Magi Madoka Magica)
18. Yui (K-on!)
19. Haruhi Suzumiya( The Melancholy of Haruhi Suzumiya)
20. Sun Seto(Seto no Hayanome;My Bride is a Mermaid)
21. Lunar Anamae(Seto no Hayanome;My Bride is a Mermaid)
22. Sakura(Cardcaptor Sakura)
23. Kyo Fujibiyashi(Clannad)
24. Kirito-forgot his real name-(Sword Art Online)
25. Yuuki Asuna(Sword Art Online)
Again these are just some of my favorite charcaters. Also, for the ones with no last name, I forgot their last name.
1. Kotomi Ichinose(Clannad)
2. Fuko Ibuki(Clannad)
3. Nagisa Furukawa(Clannad)
4. Tomoya Okasaki(Clannad)
5. Tsusaka Hiigari(Lucky Star)
6. Kagami Hiigari(Lucky Star)
7. Konata Izumi(Lucky Star)
8. Yui(Angel Beats)
9. Yuipee; Yuri(Angel Beats)
10. Kanade(Angel Beats)
11. Iwasawa(Angel Beats)
12. LeLouch(Code Geass: LeLouch of the Rebellion)
13. Karin Maaka(Chibi Vampire)
14. Negi Springfield(Negima?!: Magister Negi Magi)
15. Asuna Kagurazaka(Negima?!: Magister Negi Magi)
16. Madoka Kaname(Puella Magi Madoka Magica)
17. Kyoko(Puella Magi Madoka Magica)
18. Yui (K-on!)
19. Haruhi Suzumiya( The Melancholy of Haruhi Suzumiya)
20. Sun Seto(Seto no Hayanome;My Bride is a Mermaid)
21. Lunar Anamae(Seto no Hayanome;My Bride is a Mermaid)
22. Sakura(Cardcaptor Sakura)
23. Kyo Fujibiyashi(Clannad)
24. Kirito-forgot his real name-(Sword Art Online)
25. Yuuki Asuna(Sword Art Online)
Again these are just some of my favorite charcaters. Also, for the ones with no last name, I forgot their last name.