| Kosei vs Jin | 21–14 | 60.00% |
| Kosei vs King | 18–9 | 66.67% |
| Kosei vs Reina | 13–10 | 56.52% |
| Kosei vs Kazuya | 12–10 | 54.55% |
| Kosei vs Steve | 13–8 | 61.90% |
| Kosei vs Clive | 7–14 | 33.33% |
| Kosei vs Heihachi | 11–7 | 61.11% |
| Kosei vs Law | 10–7 | 58.82% |
| Kosei vs Bryan | 7–9 | 43.75% |
| Kosei vs Hwoarang | 5–8 | 38.46% |
| Kosei vs Lili | 8–5 | 61.54% |
| Kosei vs Azucena | 11–2 | 84.62% |
| Kosei vs Asuka | 5–7 | 41.67% |
| Kosei vs Claudio | 3–8 | 27.27% |
| Kosei vs Yoshimitsu | 4–5 | 44.44% |
| Kosei vs Jack-8 | 5–4 | 55.56% |
| Kosei vs Paul | 5–3 | 62.50% |
| Kosei vs Dragunov | 5–3 | 62.50% |
| Kosei vs Eddy | 6–2 | 75.00% |
| Kosei vs Alisa | 7–0 | 100.00% |
| Kosei vs Nina | 3–4 | 42.86% |
| Kosei vs Devil Jin | 0–6 | 0.00% |
| Kosei vs Lidia | 3–3 | 50.00% |
| Kosei vs Xiaoyu | 3–2 | 60.00% |
| Kosei vs Lars | 2–3 | 40.00% |
| Kosei vs Leroy | 2–3 | 40.00% |
| Kosei vs Leo | 2–2 | 50.00% |
| Kosei vs Jun | 4–0 | 100.00% |
| Kosei vs Raven | 3–1 | 75.00% |
| Kosei vs Feng | 0–3 | 0.00% |
| Kosei vs Lee | 1–2 | 33.33% |
| Kosei vs Victor | 3–0 | 100.00% |
| Kosei vs Kuma | 2–0 | 100.00% |
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.