| Koichi NAKAYAMA | | Cinematography | 2002, 2009, 2010, 2013, 2014, 2024 |
| Koichi NISHI | | Director | 2002 |
| Koichi OMIYA | | Director | 2012 |
| Koichi SAITO | | Script, Cinematography | 2003, 2005, 2009, 2011, 2014 |
| Koichi SAITOH | | Cinematography | 2006 |
| Koichi SATO | | Cast | 2006, 2008, 2014, 2015, 2018, 2021, 2023 |
| Koichi SETO | | Cast | 2007 |
| Koichi TOYAMA | | Cast | 2014 |
| Koichi TSUTAYA | | Music | 2012 |
| Koichi UEDA | | Cast | 2007 |
| Koichi UTSUGI | | Music | 2012 |
| Koichi YAMADERA | | Voice acting | 2008, 2013, 2014, 2021, 2025 |
| Koichiro IGAWA | | Script | 2009 |
| Koichiro IKAWA | 井川耕一郎 | Director, Script | 2012, 2015 |
| Koichiro KAWATO | | Cinematography | 2007 |
| Koichiro KINOSHITA | | Cast | 2023 |
| Koichiro NISHI | | Cast | 2003 |
| Koichiro YAMAZAKI | | Cast | 2022 |
| Koihachi TAKIGAWA | | Cast | 2023 |
| koïlab. | | World sales | 2013 |
