| SEIKO vs Dragunov | 14–22 | 38.89% |
| SEIKO vs Reina | 7–15 | 31.82% |
| SEIKO vs Jin | 10–11 | 47.62% |
| SEIKO vs King | 2–17 | 10.53% |
| SEIKO vs Kazuya | 6–11 | 35.29% |
| SEIKO vs Victor | 9–6 | 60.00% |
| SEIKO vs Bryan | 4–10 | 28.57% |
| SEIKO vs Steve | 8–6 | 57.14% |
| SEIKO vs Lili | 7–4 | 63.64% |
| SEIKO vs Lars | 5–6 | 45.45% |
| SEIKO vs Azucena | 8–1 | 88.89% |
| SEIKO vs Yoshimitsu | 5–3 | 62.50% |
| SEIKO vs Hwoarang | 4–3 | 57.14% |
| SEIKO vs Devil Jin | 4–3 | 57.14% |
| SEIKO vs Nina | 2–5 | 28.57% |
| SEIKO vs Paul | 4–2 | 66.67% |
| SEIKO vs Xiaoyu | 2–4 | 33.33% |
| SEIKO vs Shaheen | 3–3 | 50.00% |
| SEIKO vs Law | 0–5 | 0.00% |
| SEIKO vs Asuka | 1–4 | 20.00% |
| SEIKO vs Leo | 4–1 | 80.00% |
| SEIKO vs Leroy | 1–4 | 20.00% |
| SEIKO vs Jun | 3–2 | 60.00% |
| SEIKO vs Panda | 1–2 | 33.33% |
| SEIKO vs Lidia | 1–2 | 33.33% |
| SEIKO vs Jack-8 | 0–2 | 0.00% |
| SEIKO vs Feng | 0–2 | 0.00% |
| SEIKO vs Kuma | 0–2 | 0.00% |
| SEIKO vs Eddy | 0–2 | 0.00% |
| SEIKO vs Alisa | 1–0 | 100.00% |
| SEIKO vs Lee | 0–1 | 0.00% |
| SEIKO vs Raven | 0–1 | 0.00% |
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.