| Niijima vs Bryan | 117–140 | 45.53% |
| Niijima vs Reina | 127–79 | 61.65% |
| Niijima vs Jin | 120–77 | 60.91% |
| Niijima vs King | 102–94 | 52.04% |
| Niijima vs Kazuya | 112–79 | 58.64% |
| Niijima vs Steve | 97–89 | 52.15% |
| Niijima vs Heihachi | 76–84 | 47.50% |
| Niijima vs Dragunov | 78–73 | 51.66% |
| Niijima vs Law | 71–64 | 52.59% |
| Niijima vs Yoshimitsu | 77–56 | 57.89% |
| Niijima vs Lili | 71–56 | 55.91% |
| Niijima vs Devil Jin | 71–54 | 56.80% |
| Niijima vs Asuka | 62–59 | 51.24% |
| Niijima vs Hwoarang | 63–55 | 53.39% |
| Niijima vs Paul | 65–52 | 55.56% |
| Niijima vs Lee | 63–51 | 55.26% |
| Niijima vs Azucena | 60–40 | 60.00% |
| Niijima vs Feng | 38–46 | 45.24% |
| Niijima vs Clive | 40–41 | 49.38% |
| Niijima vs Leo | 37–42 | 46.84% |
| Niijima vs Lars | 36–43 | 45.57% |
| Niijima vs Victor | 40–37 | 51.95% |
| Niijima vs Lidia | 41–35 | 53.95% |
| Niijima vs Nina | 32–41 | 43.84% |
| Niijima vs Jun | 31–42 | 42.47% |
| Niijima vs Eddy | 22–45 | 32.84% |
| Niijima vs Xiaoyu | 37–29 | 56.06% |
| Niijima vs Jack-8 | 32–34 | 48.48% |
| Niijima vs Alisa | 24–32 | 42.86% |
| Niijima vs Raven | 23–33 | 41.07% |
| Niijima vs Fahkumram | 24–26 | 48.00% |
| Niijima vs Leroy | 19–25 | 43.18% |
| Niijima vs Anna | 15–28 | 34.88% |
| Niijima vs Zafina | 16–22 | 42.11% |
| Niijima vs Armor King | 26–10 | 72.22% |
| Niijima vs Shaheen | 18–16 | 52.94% |
| Niijima vs Claudio | 16–16 | 50.00% |
| Niijima vs Miary Zo | 13–18 | 41.94% |
| Niijima vs Panda | 10–12 | 45.45% |
| Niijima vs Kuma | 6–10 | 37.50% |
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.