| Niall vs Steve | 10–18 | 35.71% |
| Niall vs Jin | 5–16 | 23.81% |
| Niall vs Kazuya | 4–17 | 19.05% |
| Niall vs Hwoarang | 4–13 | 23.53% |
| Niall vs Reina | 8–6 | 57.14% |
| Niall vs Eddy | 5–8 | 38.46% |
| Niall vs King | 3–9 | 25.00% |
| Niall vs Law | 5–6 | 45.45% |
| Niall vs Nina | 6–5 | 54.55% |
| Niall vs Dragunov | 2–8 | 20.00% |
| Niall vs Jun | 3–6 | 33.33% |
| Niall vs Xiaoyu | 2–5 | 28.57% |
| Niall vs Jack-8 | 0–7 | 0.00% |
| Niall vs Lee | 4–3 | 57.14% |
| Niall vs Lidia | 4–3 | 57.14% |
| Niall vs Anna | 3–4 | 42.86% |
| Niall vs Devil Jin | 1–5 | 16.67% |
| Niall vs Lili | 1–5 | 16.67% |
| Niall vs Alisa | 5–1 | 83.33% |
| Niall vs Shaheen | 0–6 | 0.00% |
| Niall vs Leroy | 3–3 | 50.00% |
| Niall vs Bryan | 2–3 | 40.00% |
| Niall vs Leo | 0–5 | 0.00% |
| Niall vs Azucena | 1–4 | 20.00% |
| Niall vs Asuka | 2–2 | 50.00% |
| Niall vs Feng | 1–3 | 25.00% |
| Niall vs Lars | 2–2 | 50.00% |
| Niall vs Raven | 1–3 | 25.00% |
| Niall vs Clive | 2–2 | 50.00% |
| Niall vs Claudio | 2–1 | 66.67% |
| Niall vs Victor | 1–2 | 33.33% |
| Niall vs Yoshimitsu | 0–2 | 0.00% |
| 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.