| Koseira vs Jin | 21–38 | 35.59% |
| Koseira vs Steve | 26–24 | 52.00% |
| Koseira vs Kazuya | 25–20 | 55.56% |
| Koseira vs King | 13–25 | 34.21% |
| Koseira vs Lili | 21–15 | 58.33% |
| Koseira vs Reina | 20–11 | 64.52% |
| Koseira vs Clive | 20–9 | 68.97% |
| Koseira vs Law | 8–16 | 33.33% |
| Koseira vs Yoshimitsu | 9–15 | 37.50% |
| Koseira vs Victor | 12–11 | 52.17% |
| Koseira vs Bryan | 11–11 | 50.00% |
| Koseira vs Paul | 10–11 | 47.62% |
| Koseira vs Dragunov | 8–12 | 40.00% |
| Koseira vs Kuma | 6–13 | 31.58% |
| Koseira vs Claudio | 12–6 | 66.67% |
| Koseira vs Heihachi | 11–7 | 61.11% |
| Koseira vs Hwoarang | 6–11 | 35.29% |
| Koseira vs Eddy | 6–11 | 35.29% |
| Koseira vs Asuka | 4–12 | 25.00% |
| Koseira vs Xiaoyu | 1–12 | 7.69% |
| Koseira vs Alisa | 3–10 | 23.08% |
| Koseira vs Devil Jin | 4–8 | 33.33% |
| Koseira vs Leo | 7–5 | 58.33% |
| Koseira vs Lee | 5–7 | 41.67% |
| Koseira vs Jun | 6–6 | 50.00% |
| Koseira vs Azucena | 4–5 | 44.44% |
| Koseira vs Feng | 0–6 | 0.00% |
| Koseira vs Lars | 0–4 | 0.00% |
| Koseira vs Nina | 2–2 | 50.00% |
| Koseira vs Zafina | 2–2 | 50.00% |
| Koseira vs Raven | 2–2 | 50.00% |
| Koseira vs Shaheen | 2–1 | 66.67% |
| Koseira vs Lidia | 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.