| Ruma vs King | 9–20 | 31.03% |
| Ruma vs Jin | 7–16 | 30.43% |
| Ruma vs Reina | 4–15 | 21.05% |
| Ruma vs Hwoarang | 1–17 | 5.56% |
| Ruma vs Steve | 9–9 | 50.00% |
| Ruma vs Clive | 6–10 | 37.50% |
| Ruma vs Law | 2–12 | 14.29% |
| Ruma vs Lili | 2–11 | 15.38% |
| Ruma vs Asuka | 4–8 | 33.33% |
| Ruma vs Armor King | 1–11 | 8.33% |
| Ruma vs Yoshimitsu | 4–6 | 40.00% |
| Ruma vs Xiaoyu | 2–8 | 20.00% |
| Ruma vs Kazuya | 4–6 | 40.00% |
| Ruma vs Eddy | 0–10 | 0.00% |
| Ruma vs Dragunov | 4–4 | 50.00% |
| Ruma vs Jun | 1–7 | 12.50% |
| Ruma vs Azucena | 0–7 | 0.00% |
| Ruma vs Fahkumram | 1–6 | 14.29% |
| Ruma vs Devil Jin | 1–5 | 16.67% |
| Ruma vs Leo | 4–2 | 66.67% |
| Ruma vs Lee | 3–3 | 50.00% |
| Ruma vs Zafina | 2–4 | 33.33% |
| Ruma vs Leroy | 1–5 | 16.67% |
| Ruma vs Jack-8 | 1–4 | 20.00% |
| Ruma vs Victor | 0–5 | 0.00% |
| Ruma vs Lidia | 2–3 | 40.00% |
| Ruma vs Anna | 2–3 | 40.00% |
| Ruma vs Lars | 0–4 | 0.00% |
| Ruma vs Paul | 1–2 | 33.33% |
| Ruma vs Claudio | 1–2 | 33.33% |
| Ruma vs Bryan | 0–2 | 0.00% |
| Ruma vs Feng | 0–2 | 0.00% |
| Ruma vs Nina | 0–2 | 0.00% |
| Ruma vs Kuma | 0–2 | 0.00% |
| Ruma vs Alisa | 0–1 | 0.00% |
| Ruma vs Raven | 0–1 | 0.00% |
| Ruma vs Heihachi | 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.