| Firefly vs King | 249–287 | 46.46% |
| Firefly vs Bryan | 274–259 | 51.41% |
| Firefly vs Kazuya | 255–265 | 49.04% |
| Firefly vs Steve | 274–237 | 53.62% |
| Firefly vs Jin | 225–254 | 46.97% |
| Firefly vs Hwoarang | 240–202 | 54.30% |
| Firefly vs Law | 211–200–1 | 51.34% |
| Firefly vs Reina | 201–190 | 51.41% |
| Firefly vs Lars | 209–181 | 53.59% |
| Firefly vs Lee | 155–198 | 43.91% |
| Firefly vs Paul | 163–162 | 50.15% |
| Firefly vs Yoshimitsu | 167–151 | 52.52% |
| Firefly vs Lili | 154–161 | 48.89% |
| Firefly vs Azucena | 156–139 | 52.88% |
| Firefly vs Dragunov | 133–158 | 45.70% |
| Firefly vs Heihachi | 127–139 | 47.74% |
| Firefly vs Lidia | 140–116 | 54.69% |
| Firefly vs Jun | 125–123 | 50.40% |
| Firefly vs Victor | 110–118 | 48.25% |
| Firefly vs Feng | 127–99 | 56.19% |
| Firefly vs Armor King | 98–127 | 43.56% |
| Firefly vs Eddy | 113–105 | 51.83% |
| Firefly vs Asuka | 105–108 | 49.30% |
| Firefly vs Leo | 98–109 | 47.34% |
| Firefly vs Fahkumram | 111–96 | 53.62% |
| Firefly vs Raven | 91–97 | 48.40% |
| Firefly vs Xiaoyu | 90–93 | 49.18% |
| Firefly vs Devil Jin | 95–88 | 51.91% |
| Firefly vs Nina | 86–97 | 46.99% |
| Firefly vs Alisa | 92–77 | 54.44% |
| Firefly vs Anna | 79–82 | 49.07% |
| Firefly vs Jack-8 | 78–74 | 51.32% |
| Firefly vs Leroy | 67–80 | 45.58% |
| Firefly vs Clive | 77–64 | 54.61% |
| Firefly vs Kuma | 62–52 | 54.39% |
| Firefly vs Claudio | 54–48 | 52.94% |
| Firefly vs Shaheen | 44–36 | 55.00% |
| Firefly vs Zafina | 35–38 | 47.95% |
| Firefly vs Miary Zo | 33–40 | 45.21% |
| Firefly vs Panda | 13–25 | 34.21% |
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.