| Niall vs Jin | 11–17 | 39.29% |
| Niall vs Eddy | 4–11 | 26.67% |
| Niall vs Lars | 8–6 | 57.14% |
| Niall vs Law | 5–8 | 38.46% |
| Niall vs Paul | 7–5 | 58.33% |
| Niall vs Hwoarang | 4–7 | 36.36% |
| Niall vs Reina | 4–7 | 36.36% |
| Niall vs Yoshimitsu | 6–4 | 60.00% |
| Niall vs Kazuya | 4–6 | 40.00% |
| Niall vs Nina | 6–4 | 60.00% |
| Niall vs Zafina | 5–5 | 50.00% |
| Niall vs King | 4–4 | 50.00% |
| Niall vs Asuka | 4–4 | 50.00% |
| Niall vs Feng | 4–4 | 50.00% |
| Niall vs Lili | 2–6 | 25.00% |
| Niall vs Bryan | 2–5 | 28.57% |
| Niall vs Devil Jin | 1–6 | 14.29% |
| Niall vs Kuma | 1–5 | 16.67% |
| Niall vs Victor | 5–1 | 83.33% |
| Niall vs Lee | 2–3 | 40.00% |
| Niall vs Leroy | 3–2 | 60.00% |
| Niall vs Azucena | 1–4 | 20.00% |
| Niall vs Dragunov | 1–3 | 25.00% |
| Niall vs Leo | 3–1 | 75.00% |
| Niall vs Jun | 1–3 | 25.00% |
| Niall vs Raven | 2–2 | 50.00% |
| Niall vs Steve | 2–1 | 66.67% |
| Niall vs Xiaoyu | 0–2 | 0.00% |
| Niall vs Shaheen | 2–0 | 100.00% |
| Niall vs Jack-8 | 1–0 | 100.00% |
| Niall 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.