Characters
- oichi 37
- oikawa tsurara 4
- oinari-sama 8
- oinkologne 1
- oiroke 2
- ojou 9
- oka nishizawa 25
- oka yuoji 6
- okaa-san 2
- okada izou 38
- oki 1
- okidogi 6
- okiku 6
- okiku-mushi 1
- okina matara 56
- okinami 28
- okita souji alter 165
- okoge oniyama 1
- okoi 6
- okou 7
- okoye 2
- oku 1
- okuni 32
- okuni midoriyama 2
- okuyasu nijimura 5
- olaf 17
- olba frost 4
- olberic eisenberg 2
- olcadan 5
- old kai 7
- older sister spider demon 23
- oldrin zevon 2
- oleana 59
- olette 16
- olga 10
- olga discordia 45
- olga gurlukovich 1
- olga kurylenko 2
- olga marie animusphere 89
- olga pataki 12
- olha 5
- olimar 2
- olive 10
- olive oyl 18
- oliver 7
- oliver aiku 1
- oliver grayson 16
- oliver inoe 1
- olivia 125
- olivia flaversham 5