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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Atsushi Iitsuka | 2025-2025 | 3 | 1 | .750 | 3.76 | 18 | 0 | 0 | 0 | 6 | 26.1 | 24 | 11 | 0 | 16 | 23 |
| Noriyuki Ikeda | 2026-2027 | 15 | 13 | .536 | 4.14 | 49 | 49 | 0 | 0 | 0 | 258.2 | 265 | 119 | 26 | 104 | 231 |
| Kuniaki Imai | 2018-2027 | 41 | 38 | .519 | 3.71 | 558 | 12 | 0 | 0 | 83 | 670.1 | 688 | 276 | 76 | 186 | 551 |
| Dennis Inman | 2012-2022 | 56 | 39 | .589 | 3.20 | 639 | 41 | 3 | 0 | 63 | 939.1 | 801 | 334 | 78 | 348 | 985 |
| Shojiro Inoue | 2027-2027 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Yeijiro Ishihara | 2024-2027 | 31 | 49 | .388 | 4.90 | 117 | 90 | 15 | 4 | 0 | 632.1 | 717 | 344 | 99 | 238 | 406 |
| Osamu Ishii | 2026-2027 | 2 | 0 | 1.000 | 4.98 | 34 | 0 | 0 | 0 | 2 | 43.1 | 59 | 24 | 9 | 23 | 41 |
| Yasuhiko Ito | 2023-2027 | 51 | 38 | .573 | 5.00 | 143 | 143 | 0 | 0 | 0 | 818.0 | 935 | 454 | 135 | 192 | 607 |
| Okakura Iwasaki | 2021-2022 | 5 | 6 | .455 | 6.08 | 23 | 13 | 0 | 0 | 1 | 80.0 | 110 | 54 | 15 | 29 | 51 |
