| Niamhfox vs Heihachi | 3–14 | 17.65% |
| Niamhfox vs Kazuya | 7–7 | 50.00% |
| Niamhfox vs King | 5–6 | 45.45% |
| Niamhfox vs Asuka | 1–7 | 12.50% |
| Niamhfox vs Dragunov | 6–2 | 75.00% |
| Niamhfox vs Reina | 7–1 | 87.50% |
| Niamhfox vs Bryan | 3–4 | 42.86% |
| Niamhfox vs Jack-8 | 3–1 | 75.00% |
| Niamhfox vs Lee | 1–3 | 25.00% |
| Niamhfox vs Hwoarang | 2–1 | 66.67% |
| Niamhfox vs Jin | 2–1 | 66.67% |
| Niamhfox vs Steve | 3–0 | 100.00% |
| Niamhfox vs Yoshimitsu | 0–2 | 0.00% |
| Niamhfox vs Xiaoyu | 0–2 | 0.00% |
| Niamhfox vs Leo | 2–0 | 100.00% |
| Niamhfox vs Shaheen | 0–2 | 0.00% |
| Niamhfox vs Leroy | 0–2 | 0.00% |
| Niamhfox vs Jun | 1–1 | 50.00% |
| Niamhfox vs Victor | 0–2 | 0.00% |
| Niamhfox vs Eddy | 0–2 | 0.00% |
| Niamhfox vs Lidia | 0–2 | 0.00% |
| Niamhfox vs Paul | 1–0 | 100.00% |
| Niamhfox vs Law | 0–1 | 0.00% |
| Niamhfox vs Devil Jin | 0–1 | 0.00% |
| Niamhfox vs Lars | 0–1 | 0.00% |
| Niamhfox vs Claudio | 1–0 | 100.00% |
| Niamhfox vs Kuma | 0–1 | 0.00% |
| Niamhfox vs Azucena | 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.