| Cthulhu vs Reina | 12–16 | 42.86% |
| Cthulhu vs Jin | 12–12 | 50.00% |
| Cthulhu vs Lidia | 10–12 | 45.45% |
| Cthulhu vs King | 11–8 | 57.89% |
| Cthulhu vs Hwoarang | 4–14 | 22.22% |
| Cthulhu vs Jun | 7–11 | 38.89% |
| Cthulhu vs Lili | 7–10 | 41.18% |
| Cthulhu vs Law | 3–13 | 18.75% |
| Cthulhu vs Kazuya | 5–11 | 31.25% |
| Cthulhu vs Asuka | 6–10 | 37.50% |
| Cthulhu vs Steve | 7–7 | 50.00% |
| Cthulhu vs Victor | 6–6 | 50.00% |
| Cthulhu vs Eddy | 5–6 | 45.45% |
| Cthulhu vs Yoshimitsu | 5–4 | 55.56% |
| Cthulhu vs Dragunov | 5–3 | 62.50% |
| Cthulhu vs Feng | 2–4 | 33.33% |
| Cthulhu vs Leo | 3–3 | 50.00% |
| Cthulhu vs Claudio | 4–2 | 66.67% |
| Cthulhu vs Paul | 3–2 | 60.00% |
| Cthulhu vs Lars | 2–3 | 40.00% |
| Cthulhu vs Alisa | 4–1 | 80.00% |
| Cthulhu vs Bryan | 0–4 | 0.00% |
| Cthulhu vs Jack-8 | 3–1 | 75.00% |
| Cthulhu vs Shaheen | 3–1 | 75.00% |
| Cthulhu vs Nina | 3–1 | 75.00% |
| Cthulhu vs Zafina | 1–3 | 25.00% |
| Cthulhu vs Azucena | 2–2 | 50.00% |
| Cthulhu vs Devil Jin | 1–2 | 33.33% |
| Cthulhu vs Panda | 0–3 | 0.00% |
| Cthulhu vs Xiaoyu | 0–2 | 0.00% |
| Cthulhu vs Lee | 0–2 | 0.00% |
| Cthulhu vs Leroy | 1–1 | 50.00% |
| Cthulhu vs Raven | 0–2 | 0.00% |
| Cthulhu vs Heihachi | 1–1 | 50.00% |
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.