| Kajima Rei vs Jin | 43–46 | 48.31% |
| Kajima Rei vs Kazuya | 31–53 | 36.90% |
| Kajima Rei vs Law | 31–46 | 40.26% |
| Kajima Rei vs Hwoarang | 22–38 | 36.67% |
| Kajima Rei vs Steve | 32–28 | 53.33% |
| Kajima Rei vs King | 20–32 | 38.46% |
| Kajima Rei vs Bryan | 21–26 | 44.68% |
| Kajima Rei vs Anna | 14–23 | 37.84% |
| Kajima Rei vs Dragunov | 17–18 | 48.57% |
| Kajima Rei vs Alisa | 16–18 | 47.06% |
| Kajima Rei vs Paul | 16–17 | 48.48% |
| Kajima Rei vs Jun | 19–14 | 57.58% |
| Kajima Rei vs Nina | 5–26 | 16.13% |
| Kajima Rei vs Eddy | 14–16 | 46.67% |
| Kajima Rei vs Lili | 17–12 | 58.62% |
| Kajima Rei vs Heihachi | 16–12 | 57.14% |
| Kajima Rei vs Clive | 11–17 | 39.29% |
| Kajima Rei vs Reina | 9–18 | 33.33% |
| Kajima Rei vs Yoshimitsu | 13–12 | 52.00% |
| Kajima Rei vs Lars | 9–9 | 50.00% |
| Kajima Rei vs Xiaoyu | 8–9 | 47.06% |
| Kajima Rei vs Asuka | 5–12 | 29.41% |
| Kajima Rei vs Kuma | 8–9 | 47.06% |
| Kajima Rei vs Raven | 11–6 | 64.71% |
| Kajima Rei vs Lidia | 7–10 | 41.18% |
| Kajima Rei vs Jack-8 | 9–7 | 56.25% |
| Kajima Rei vs Feng | 5–10 | 33.33% |
| Kajima Rei vs Azucena | 5–10 | 33.33% |
| Kajima Rei vs Victor | 7–8 | 46.67% |
| Kajima Rei vs Leroy | 10–4 | 71.43% |
| Kajima Rei vs Claudio | 6–6 | 50.00% |
| Kajima Rei vs Fahkumram | 4–7 | 36.36% |
| Kajima Rei vs Devil Jin | 5–4 | 55.56% |
| Kajima Rei vs Lee | 2–7 | 22.22% |
| Kajima Rei vs Miary Zo | 5–2 | 71.43% |
| Kajima Rei vs Leo | 3–3 | 50.00% |
| Kajima Rei vs Zafina | 4–1 | 80.00% |
| Kajima Rei vs Armor King | 5–0 | 100.00% |
| Kajima Rei vs Shaheen | 1–2 | 33.33% |
| Kajima Rei vs Panda | 0–2 | 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.