Characters
- ookanehira 26
- ookurikara 120
- oola 38
- oolong 317
- oosaki 1
- ooshio 50
- ooyama 1
- ooyodo 226
- oozaru 3
- oozora subaru 647
- opal 11
- opal bei fong 8
- opera 1
- opera kobayashi 1
- opera kranz 2
- operator 21o 1
- operator 6o 1
- ophanimon 4
- ophelia 19
- ophelia phamrsolone 4
- ophelia ramirez 11
- ophilia clement 3
- ophion 29
- ophis 3
- ophiuchus shaina 61
- optimus prime 24
- ora 8
- oracle 13
- orange 2
- orange heart 26
- orange pekoe 103
- orba 3
- orca 10
- orcera 1
- orchid 23
- ord 2
- ordinary woman 35
- orem 3
- orfevre 5
- orga itsuka 57
- orga nanagear 1
- orga sabnak 5
- ori 14
- oriana thomson 50
- orianna 34
- orie ballardiae harada 3
- orie kayama 12
- orie kusanagi 1
- orie takadate 1
- orielle 1