| koisa vs Kazuya | 55–38 | 59.14% |
| koisa vs Dragunov | 43–38 | 53.09% |
| koisa vs Paul | 36–31 | 53.73% |
| koisa vs Hwoarang | 32–25 | 56.14% |
| koisa vs King | 29–24 | 54.72% |
| koisa vs Steve | 30–20 | 60.00% |
| koisa vs Bryan | 24–25 | 48.98% |
| koisa vs Reina | 25–24 | 51.02% |
| koisa vs Heihachi | 25–21 | 54.35% |
| koisa vs Jin | 26–12 | 68.42% |
| koisa vs Law | 10–20 | 33.33% |
| koisa vs Lili | 14–14 | 50.00% |
| koisa vs Feng | 16–11 | 59.26% |
| koisa vs Lidia | 15–11 | 57.69% |
| koisa vs Yoshimitsu | 8–17 | 32.00% |
| koisa vs Jun | 14–11 | 56.00% |
| koisa vs Azucena | 17–7 | 70.83% |
| koisa vs Claudio | 12–10 | 54.55% |
| koisa vs Lee | 9–12 | 42.86% |
| koisa vs Jack-8 | 15–5 | 75.00% |
| koisa vs Asuka | 10–10 | 50.00% |
| koisa vs Victor | 9–11 | 45.00% |
| koisa vs Alisa | 8–10 | 44.44% |
| koisa vs Nina | 11–6 | 64.71% |
| koisa vs Eddy | 7–8 | 46.67% |
| koisa vs Lars | 2–12 | 14.29% |
| koisa vs Devil Jin | 9–4 | 69.23% |
| koisa vs Xiaoyu | 3–9 | 25.00% |
| koisa vs Shaheen | 4–8 | 33.33% |
| koisa vs Leo | 6–5 | 54.55% |
| koisa vs Leroy | 7–3 | 70.00% |
| koisa vs Kuma | 3–2 | 60.00% |
| koisa vs Zafina | 3–2 | 60.00% |
| koisa vs Panda | 3–1 | 75.00% |
| koisa vs Raven | 2–2 | 50.00% |
| koisa vs Clive | 1–1 | 50.00% |
| koisa vs Fahkumram | 2–0 | 100.00% |
| koisa vs Anna | 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.