| Takuro IJICHI | 伊地知拓郎 | Director, Script, Cinematography | 2025 |
| Yusuke ISEYA | 伊勢谷友介 | Director, Script, Cast, Voice acting | 2003, 2004, 2006, 2007, 2010, 2012, 2015, 2019, 2024 |
| Yoshihiro ITO | 伊刀嘉紘 | Director | 2005, 2008 |
| Shujian REN | 任書剣 | Director | 2004 |
| Kohei SENGEN | 仙元浩平 | Director, Script | 2022 |
| Rikiya IMAIZUMI | 今泉力哉 | Director, Script | 2011, 2012, 2016, 2021, 2023 |
| Eiichi IMAMURA | 今村瑛一 | Director, Script, Original author | 2020 |
| Shohei IMAMURA | 今村昌平 | Director | 2020 |
| Ayako IMAMURA | 今村彩子 | Director, Cinematography, World sales | 2014, 2017, 2021 |
| Keisuke IMAMURA | 今村圭佑 | Director, Cinematography | 2020, 2021, 2023, 2024 |
| Satoshi KON | 今敏 | Director, Script | 2000, 2005, 2007, 2010, 2022, 2025 |
| Kazuyuki IZUTSU | 井筒和幸 | Director, Script | 2002, 2009, 2011 |
| Koichiro IKAWA | 井川耕一郎 | Director, Script | 2012, 2015 |
| Kishu IZUCHI | 井土紀州 | Director, Script | 2004, 2005, 2008, 2009, 2011 |
| Junichi INOUE | 井上淳一 | Director, Script | 2014, 2019, 2024 |
| Morito INOUE | 井上森人 | Director, Script | 2025 |
| Kohei IGARASHI | 五十嵐耕平 | Director, Script | 2015, 2018, 2025 |
| Sarina NIHEI | 二瓶紗吏奈 | Director | 2015, 2018, 2020 |
| Ryutaro NINOMIYA | 二ノ宮隆太郎 | Director, Script, Cast | 2016, 2020, 2023, 2024 |
| Takeshi KAMEI | 亀井岳 | Director, Script, World sales | 2023 |
