| Koseiii vs Kazuya | 27–20 | 57.45% |
| Koseiii vs Yoshimitsu | 15–25 | 37.50% |
| Koseiii vs Bryan | 21–19 | 52.50% |
| Koseiii vs Dragunov | 16–22 | 42.11% |
| Koseiii vs Victor | 25–13 | 65.79% |
| Koseiii vs Jin | 17–18 | 48.57% |
| Koseiii vs Steve | 19–12 | 61.29% |
| Koseiii vs Lili | 19–6 | 76.00% |
| Koseiii vs Hwoarang | 14–10 | 58.33% |
| Koseiii vs Clive | 11–13 | 45.83% |
| Koseiii vs King | 11–12 | 47.83% |
| Koseiii vs Paul | 6–15 | 28.57% |
| Koseiii vs Devil Jin | 12–7 | 63.16% |
| Koseiii vs Lee | 11–8 | 57.89% |
| Koseiii vs Lars | 13–5 | 72.22% |
| Koseiii vs Jun | 9–8 | 52.94% |
| Koseiii vs Feng | 6–10 | 37.50% |
| Koseiii vs Heihachi | 10–6 | 62.50% |
| Koseiii vs Xiaoyu | 9–6 | 60.00% |
| Koseiii vs Law | 9–5 | 64.29% |
| Koseiii vs Eddy | 9–4 | 69.23% |
| Koseiii vs Reina | 2–10 | 16.67% |
| Koseiii vs Asuka | 8–3 | 72.73% |
| Koseiii vs Claudio | 3–7 | 30.00% |
| Koseiii vs Nina | 7–2 | 77.78% |
| Koseiii vs Armor King | 8–1 | 88.89% |
| Koseiii vs Jack-8 | 6–1 | 85.71% |
| Koseiii vs Lidia | 6–1 | 85.71% |
| Koseiii vs Leroy | 4–2 | 66.67% |
| Koseiii vs Kuma | 2–3 | 40.00% |
| Koseiii vs Zafina | 0–5 | 0.00% |
| Koseiii vs Raven | 1–2 | 33.33% |
| Koseiii vs Alisa | 0–2 | 0.00% |
| Koseiii vs Shaheen | 0–2 | 0.00% |
| Koseiii vs Panda | 0–2 | 0.00% |
| Koseiii vs Azucena | 0–2 | 0.00% |
| Koseiii vs Leo | 0–1 | 0.00% |
Limitations
This data is often requested to give insight into which characters you have more trouble with than others, but it is not particularly helpful for that. The main issue is that it is heavily skewed by how strong the opponents you play are.
For example, this data suggests my worst matchup is clearly vs Reina, but that's just because most of those games are vs Yagami.
There is a way to account for this being worked on. The central idea is to assign each matchup a rating vs you which adjusts based on the result, much like the regular rating but also based on the rating of each player. With this, it would give a better summary of how well you perform vs each character.
In the meantime, this page is here to present the data as requested.