| Nishii vs Hwoarang | 72–93 | 43.64% |
| Nishii vs Jin | 67–89 | 42.95% |
| Nishii vs King | 88–66 | 57.14% |
| Nishii vs Kazuya | 67–76 | 46.85% |
| Nishii vs Yoshimitsu | 47–74 | 38.84% |
| Nishii vs Reina | 61–59 | 50.83% |
| Nishii vs Law | 51–65 | 43.97% |
| Nishii vs Bryan | 57–45 | 55.88% |
| Nishii vs Lili | 44–49 | 47.31% |
| Nishii vs Jun | 49–41–1 | 54.44% |
| Nishii vs Paul | 43–42 | 50.59% |
| Nishii vs Dragunov | 51–30 | 62.96% |
| Nishii vs Feng | 41–37 | 52.56% |
| Nishii vs Steve | 29–48 | 37.66% |
| Nishii vs Eddy | 27–34 | 44.26% |
| Nishii vs Heihachi | 29–30 | 49.15% |
| Nishii vs Leroy | 19–38 | 33.33% |
| Nishii vs Xiaoyu | 29–26 | 52.73% |
| Nishii vs Nina | 34–19 | 64.15% |
| Nishii vs Devil Jin | 26–25 | 50.98% |
| Nishii vs Lars | 22–26 | 45.83% |
| Nishii vs Fahkumram | 27–20 | 57.45% |
| Nishii vs Alisa | 17–29 | 36.96% |
| Nishii vs Lee | 21–24 | 46.67% |
| Nishii vs Jack-8 | 22–18 | 55.00% |
| Nishii vs Asuka | 21–19 | 52.50% |
| Nishii vs Victor | 14–24 | 36.84% |
| Nishii vs Raven | 23–14 | 62.16% |
| Nishii vs Azucena | 18–17 | 51.43% |
| Nishii vs Leo | 12–17 | 41.38% |
| Nishii vs Shaheen | 20–7 | 74.07% |
| Nishii vs Clive | 17–10 | 62.96% |
| Nishii vs Zafina | 12–13 | 48.00% |
| Nishii vs Anna | 10–14 | 41.67% |
| Nishii vs Kuma | 7–8 | 46.67% |
| Nishii vs Claudio | 6–5 | 54.55% |
| Nishii vs Panda | 3–5 | 37.50% |
| Nishii vs Lidia | 4–4 | 50.00% |
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.