| Byleth vs Heihachi | 9–18 | 33.33% |
| Byleth vs Reina | 15–9 | 62.50% |
| Byleth vs Steve | 6–13 | 31.58% |
| Byleth vs Lars | 7–12 | 36.84% |
| Byleth vs Paul | 8–10 | 44.44% |
| Byleth vs Lee | 6–9 | 40.00% |
| Byleth vs Jun | 2–13 | 13.33% |
| Byleth vs Azucena | 7–8 | 46.67% |
| Byleth vs Lidia | 8–7 | 53.33% |
| Byleth vs Kazuya | 6–8 | 42.86% |
| Byleth vs Law | 8–5 | 61.54% |
| Byleth vs Dragunov | 4–9 | 30.77% |
| Byleth vs Alisa | 4–9 | 30.77% |
| Byleth vs Jin | 4–8 | 33.33% |
| Byleth vs Bryan | 5–7 | 41.67% |
| Byleth vs Victor | 7–5 | 58.33% |
| Byleth vs King | 5–6 | 45.45% |
| Byleth vs Hwoarang | 4–7 | 36.36% |
| Byleth vs Leo | 6–3 | 66.67% |
| Byleth vs Panda | 3–5 | 37.50% |
| Byleth vs Asuka | 0–7 | 0.00% |
| Byleth vs Yoshimitsu | 3–3 | 50.00% |
| Byleth vs Claudio | 2–4 | 33.33% |
| Byleth vs Shaheen | 3–2 | 60.00% |
| Byleth vs Nina | 1–4 | 20.00% |
| Byleth vs Raven | 3–2 | 60.00% |
| Byleth vs Xiaoyu | 2–2 | 50.00% |
| Byleth vs Jack-8 | 2–2 | 50.00% |
| Byleth vs Lili | 2–2 | 50.00% |
| Byleth vs Eddy | 1–3 | 25.00% |
| Byleth vs Devil Jin | 1–2 | 33.33% |
| Byleth vs Clive | 1–2 | 33.33% |
| Byleth vs Feng | 0–2 | 0.00% |
| Byleth vs Kuma | 0–2 | 0.00% |
| Byleth vs Leroy | 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.