| Seppukuma vs King | 32–60 | 34.78% |
| Seppukuma vs Jin | 26–38 | 40.62% |
| Seppukuma vs Dragunov | 20–41 | 32.79% |
| Seppukuma vs Heihachi | 29–32 | 47.54% |
| Seppukuma vs Kazuya | 33–27 | 55.00% |
| Seppukuma vs Reina | 32–23 | 58.18% |
| Seppukuma vs Steve | 29–25 | 53.70% |
| Seppukuma vs Bryan | 21–25 | 45.65% |
| Seppukuma vs Armor King | 18–26 | 40.91% |
| Seppukuma vs Clive | 19–18 | 51.35% |
| Seppukuma vs Yoshimitsu | 13–23 | 36.11% |
| Seppukuma vs Azucena | 20–15 | 57.14% |
| Seppukuma vs Hwoarang | 13–19 | 40.62% |
| Seppukuma vs Xiaoyu | 19–11 | 63.33% |
| Seppukuma vs Fahkumram | 15–15 | 50.00% |
| Seppukuma vs Law | 12–17 | 41.38% |
| Seppukuma vs Lee | 15–14 | 51.72% |
| Seppukuma vs Lili | 13–15 | 46.43% |
| Seppukuma vs Paul | 11–15 | 42.31% |
| Seppukuma vs Asuka | 10–15 | 40.00% |
| Seppukuma vs Lars | 12–13 | 48.00% |
| Seppukuma vs Jun | 12–12 | 50.00% |
| Seppukuma vs Leo | 9–13 | 40.91% |
| Seppukuma vs Eddy | 14–8 | 63.64% |
| Seppukuma vs Miary Zo | 11–11 | 50.00% |
| Seppukuma vs Lidia | 9–11 | 45.00% |
| Seppukuma vs Victor | 8–10 | 44.44% |
| Seppukuma vs Devil Jin | 11–6 | 64.71% |
| Seppukuma vs Alisa | 7–9 | 43.75% |
| Seppukuma vs Nina | 9–7 | 56.25% |
| Seppukuma vs Shaheen | 12–3 | 80.00% |
| Seppukuma vs Feng | 2–10 | 16.67% |
| Seppukuma vs Leroy | 7–3 | 70.00% |
| Seppukuma vs Jack-8 | 2–7 | 22.22% |
| Seppukuma vs Claudio | 5–3 | 62.50% |
| Seppukuma vs Kuma | 3–5 | 37.50% |
| Seppukuma vs Zafina | 6–2 | 75.00% |
| Seppukuma vs Raven | 3–5 | 37.50% |
| Seppukuma vs Anna | 2–2 | 50.00% |
| Seppukuma vs Panda | 1–0 | 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.