| Onyxian vs Clive | 41–68 | 37.61% |
| Onyxian vs Kazuya | 49–56 | 46.67% |
| Onyxian vs Heihachi | 38–64 | 37.25% |
| Onyxian vs King | 44–46 | 48.89% |
| Onyxian vs Jin | 28–60 | 31.82% |
| Onyxian vs Steve | 45–29 | 60.81% |
| Onyxian vs Law | 32–41 | 43.84% |
| Onyxian vs Eddy | 23–46 | 33.33% |
| Onyxian vs Reina | 29–35 | 45.31% |
| Onyxian vs Hwoarang | 25–38 | 39.68% |
| Onyxian vs Xiaoyu | 27–34 | 44.26% |
| Onyxian vs Lili | 24–34 | 41.38% |
| Onyxian vs Jun | 30–27 | 52.63% |
| Onyxian vs Bryan | 27–29 | 48.21% |
| Onyxian vs Asuka | 28–22 | 56.00% |
| Onyxian vs Lee | 26–21 | 55.32% |
| Onyxian vs Azucena | 18–29 | 38.30% |
| Onyxian vs Leo | 22–21 | 51.16% |
| Onyxian vs Lars | 16–24 | 40.00% |
| Onyxian vs Paul | 16–21 | 43.24% |
| Onyxian vs Victor | 17–16 | 51.52% |
| Onyxian vs Yoshimitsu | 17–15 | 53.12% |
| Onyxian vs Nina | 17–14 | 54.84% |
| Onyxian vs Devil Jin | 12–17 | 41.38% |
| Onyxian vs Lidia | 10–18 | 35.71% |
| Onyxian vs Leroy | 14–13 | 51.85% |
| Onyxian vs Feng | 12–14 | 46.15% |
| Onyxian vs Dragunov | 11–15 | 42.31% |
| Onyxian vs Claudio | 12–10 | 54.55% |
| Onyxian vs Alisa | 10–11 | 47.62% |
| Onyxian vs Jack-8 | 13–5 | 72.22% |
| Onyxian vs Shaheen | 6–11 | 35.29% |
| Onyxian vs Kuma | 6–11 | 35.29% |
| Onyxian vs Raven | 11–5 | 68.75% |
| Onyxian vs Zafina | 8–7 | 53.33% |
| Onyxian vs Anna | 1–1 | 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.