| Fefnir vs Fahkumram | 50–38 | 56.82% |
| Fefnir vs Kazuya | 47–33 | 58.75% |
| Fefnir vs Bryan | 48–29 | 62.34% |
| Fefnir vs King | 44–27 | 61.97% |
| Fefnir vs Steve | 36–24 | 60.00% |
| Fefnir vs Hwoarang | 28–27 | 50.91% |
| Fefnir vs Jin | 29–25 | 53.70% |
| Fefnir vs Heihachi | 16–26 | 38.10% |
| Fefnir vs Reina | 23–16 | 58.97% |
| Fefnir vs Lee | 26–12 | 68.42% |
| Fefnir vs Yoshimitsu | 15–20 | 42.86% |
| Fefnir vs Law | 20–13 | 60.61% |
| Fefnir vs Lidia | 21–12 | 63.64% |
| Fefnir vs Feng | 16–16 | 50.00% |
| Fefnir vs Lili | 18–13 | 58.06% |
| Fefnir vs Dragunov | 15–16 | 48.39% |
| Fefnir vs Azucena | 20–11 | 64.52% |
| Fefnir vs Lars | 15–13 | 53.57% |
| Fefnir vs Xiaoyu | 10–15 | 40.00% |
| Fefnir vs Devil Jin | 8–14 | 36.36% |
| Fefnir vs Raven | 11–11 | 50.00% |
| Fefnir vs Eddy | 14–8 | 63.64% |
| Fefnir vs Leo | 13–8 | 61.90% |
| Fefnir vs Jack-8 | 8–12 | 40.00% |
| Fefnir vs Asuka | 11–9 | 55.00% |
| Fefnir vs Nina | 8–10 | 44.44% |
| Fefnir vs Kuma | 12–6 | 66.67% |
| Fefnir vs Paul | 9–8 | 52.94% |
| Fefnir vs Victor | 10–7 | 58.82% |
| Fefnir vs Zafina | 7–9 | 43.75% |
| Fefnir vs Claudio | 7–8 | 46.67% |
| Fefnir vs Clive | 7–7 | 50.00% |
| Fefnir vs Leroy | 6–7 | 46.15% |
| Fefnir vs Shaheen | 7–3 | 70.00% |
| Fefnir vs Alisa | 1–8 | 11.11% |
| Fefnir vs Jun | 4–5 | 44.44% |
| Fefnir vs Anna | 3–5 | 37.50% |
| Fefnir vs Panda | 2–0 | 100.00% |
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.