| Koopi vs King | 9–12 | 42.86% |
| Koopi vs Lidia | 13–8 | 61.90% |
| Koopi vs Steve | 13–5 | 72.22% |
| Koopi vs Reina | 8–4 | 66.67% |
| Koopi vs Kazuya | 6–4 | 60.00% |
| Koopi vs Eddy | 5–5 | 50.00% |
| Koopi vs Jin | 5–3 | 62.50% |
| Koopi vs Bryan | 5–3 | 62.50% |
| Koopi vs Miary Zo | 7–0 | 100.00% |
| Koopi vs Law | 1–5 | 16.67% |
| Koopi vs Lili | 3–3 | 50.00% |
| Koopi vs Jun | 3–3 | 50.00% |
| Koopi vs Asuka | 3–2 | 60.00% |
| Koopi vs Lars | 5–0 | 100.00% |
| Koopi vs Alisa | 2–3 | 40.00% |
| Koopi vs Clive | 1–4 | 20.00% |
| Koopi vs Paul | 4–0 | 100.00% |
| Koopi vs Hwoarang | 2–2 | 50.00% |
| Koopi vs Xiaoyu | 4–0 | 100.00% |
| Koopi vs Feng | 3–1 | 75.00% |
| Koopi vs Lee | 2–1 | 66.67% |
| Koopi vs Panda | 2–1 | 66.67% |
| Koopi vs Victor | 3–0 | 100.00% |
| Koopi vs Dragunov | 1–1 | 50.00% |
| Koopi vs Leo | 0–2 | 0.00% |
| Koopi vs Nina | 0–2 | 0.00% |
| Koopi vs Kuma | 0–2 | 0.00% |
| Koopi vs Azucena | 0–2 | 0.00% |
| Koopi vs Heihachi | 2–0 | 100.00% |
| Koopi vs Raven | 1–0 | 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.