| Jani Joestar vs King | 11–10 | 52.38% |
| Jani Joestar vs Hwoarang | 11–2 | 84.62% |
| Jani Joestar vs Xiaoyu | 7–5 | 58.33% |
| Jani Joestar vs Dragunov | 9–3 | 75.00% |
| Jani Joestar vs Kazuya | 10–0 | 100.00% |
| Jani Joestar vs Lili | 6–4 | 60.00% |
| Jani Joestar vs Reina | 4–5 | 44.44% |
| Jani Joestar vs Azucena | 6–3 | 66.67% |
| Jani Joestar vs Paul | 4–4 | 50.00% |
| Jani Joestar vs Steve | 4–4 | 50.00% |
| Jani Joestar vs Jin | 4–3 | 57.14% |
| Jani Joestar vs Law | 4–2 | 66.67% |
| Jani Joestar vs Bryan | 6–0 | 100.00% |
| Jani Joestar vs Alisa | 4–2 | 66.67% |
| Jani Joestar vs Raven | 1–4 | 20.00% |
| Jani Joestar vs Eddy | 4–1 | 80.00% |
| Jani Joestar vs Lars | 4–0 | 100.00% |
| Jani Joestar vs Nina | 2–2 | 50.00% |
| Jani Joestar vs Lee | 2–2 | 50.00% |
| Jani Joestar vs Armor King | 4–0 | 100.00% |
| Jani Joestar vs Yoshimitsu | 0–3 | 0.00% |
| Jani Joestar vs Jack-8 | 2–1 | 66.67% |
| Jani Joestar vs Asuka | 2–1 | 66.67% |
| Jani Joestar vs Claudio | 2–1 | 66.67% |
| Jani Joestar vs Jun | 0–3 | 0.00% |
| Jani Joestar vs Victor | 3–0 | 100.00% |
| Jani Joestar vs Heihachi | 2–1 | 66.67% |
| Jani Joestar vs Devil Jin | 2–0 | 100.00% |
| Jani Joestar vs Zafina | 2–0 | 100.00% |
| Jani Joestar vs Leroy | 2–0 | 100.00% |
| Jani Joestar vs Lidia | 0–2 | 0.00% |
| Jani Joestar vs Feng | 1–0 | 100.00% |
| Jani Joestar vs Leo | 0–1 | 0.00% |
| Jani Joestar vs Kuma | 1–0 | 100.00% |
| Jani Joestar vs Clive | 0–1 | 0.00% |
| Jani Joestar vs Fahkumram | 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.