Characters
- oshizu murasame 9
- osira 53
- oslow 2
- osomatsu matsuno 231
- oswald 9
- oswidge 1
- otabek altin 18
- otachi 1
- otaki aoyama 2
- otako 22
- otaru mamiya 14
- otegine 41
- othinus 6
- oto tachibana 1
- otogi 20
- otogi tenjinyama 19
- otogibara era 36
- otoha sakurano 3
- otoha umeki 5
- otohime 3
- otohime ryuuguu 10
- otoko hotaruzuka 4
- otome akiyama 2
- otome arisugawa 19
- otome asakura 35
- otome katou 6
- otome kurogane 8
- otome nanaura 1
- otome saotome 4
- otome tsuzuki 1
- otome yanagiya 7
- otomi tachibana 1
- otomonin wanmaru 1
- otonose kanade 69
- otonoshin koito 20
- otoya ittoki 70
- ots-14 39
- otsuu tsurugaya 4
- ottar 3
- otto rocket 1
- otto suewen 1
- ouga makyouin 3
- ougai mori 1
- ougi 2
- ougi oshino 30
- ouji masamune 1
- ouka 8
- ouka hayasaka 2
- ouka nagisa 36
- ouka shiunji 2