| Koiwi vs Jin | 25–36 | 40.98% |
| Koiwi vs King | 20–22 | 47.62% |
| Koiwi vs Reina | 21–13 | 61.76% |
| Koiwi vs Steve | 12–18 | 40.00% |
| Koiwi vs Lili | 13–13 | 50.00% |
| Koiwi vs Dragunov | 4–20 | 16.67% |
| Koiwi vs Paul | 7–16 | 30.43% |
| Koiwi vs Jun | 15–8 | 65.22% |
| Koiwi vs Lee | 7–15 | 31.82% |
| Koiwi vs Yoshimitsu | 9–12 | 42.86% |
| Koiwi vs Law | 8–12 | 40.00% |
| Koiwi vs Kazuya | 5–14 | 26.32% |
| Koiwi vs Azucena | 7–12 | 36.84% |
| Koiwi vs Hwoarang | 7–10 | 41.18% |
| Koiwi vs Bryan | 2–14 | 12.50% |
| Koiwi vs Devil Jin | 12–4 | 75.00% |
| Koiwi vs Eddy | 5–9 | 35.71% |
| Koiwi vs Feng | 4–9 | 30.77% |
| Koiwi vs Xiaoyu | 6–6 | 50.00% |
| Koiwi vs Alisa | 4–6 | 40.00% |
| Koiwi vs Victor | 4–6 | 40.00% |
| Koiwi vs Jack-8 | 2–7 | 22.22% |
| Koiwi vs Claudio | 2–7 | 22.22% |
| Koiwi vs Nina | 5–4 | 55.56% |
| Koiwi vs Asuka | 4–4 | 50.00% |
| Koiwi vs Leo | 6–0 | 100.00% |
| Koiwi vs Leroy | 3–3 | 50.00% |
| Koiwi vs Raven | 2–4 | 33.33% |
| Koiwi vs Kuma | 2–3 | 40.00% |
| Koiwi vs Zafina | 3–2 | 60.00% |
| Koiwi vs Shaheen | 1–3 | 25.00% |
| Koiwi vs Lars | 1–2 | 33.33% |
| Koiwi vs Panda | 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.