| Sephiroth vs Reina | 11–11 | 50.00% |
| Sephiroth vs Jin | 8–12 | 40.00% |
| Sephiroth vs Kazuya | 9–11 | 45.00% |
| Sephiroth vs Xiaoyu | 6–10 | 37.50% |
| Sephiroth vs Steve | 8–8 | 50.00% |
| Sephiroth vs Paul | 8–4 | 66.67% |
| Sephiroth vs King | 6–4 | 60.00% |
| Sephiroth vs Hwoarang | 4–5 | 44.44% |
| Sephiroth vs Bryan | 4–5 | 44.44% |
| Sephiroth vs Feng | 5–4 | 55.56% |
| Sephiroth vs Lili | 4–5 | 44.44% |
| Sephiroth vs Asuka | 3–5 | 37.50% |
| Sephiroth vs Lee | 6–2 | 75.00% |
| Sephiroth vs Jun | 3–4 | 42.86% |
| Sephiroth vs Yoshimitsu | 4–2 | 66.67% |
| Sephiroth vs Lars | 2–3 | 40.00% |
| Sephiroth vs Alisa | 4–1 | 80.00% |
| Sephiroth vs Leroy | 3–2 | 60.00% |
| Sephiroth vs Azucena | 1–4 | 20.00% |
| Sephiroth vs Dragunov | 3–1 | 75.00% |
| Sephiroth vs Victor | 1–3 | 25.00% |
| Sephiroth vs Eddy | 3–1 | 75.00% |
| Sephiroth vs Devil Jin | 1–2 | 33.33% |
| Sephiroth vs Claudio | 1–2 | 33.33% |
| Sephiroth vs Kuma | 1–2 | 33.33% |
| Sephiroth vs Leo | 0–2 | 0.00% |
| Sephiroth vs Nina | 2–0 | 100.00% |
| Sephiroth vs Panda | 2–0 | 100.00% |
| Sephiroth vs Law | 1–0 | 100.00% |
| Sephiroth 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.