| Poseidon vs King | 14–18 | 43.75% |
| Poseidon vs Heihachi | 11–20 | 35.48% |
| Poseidon vs Hwoarang | 7–17–1 | 29.17% |
| Poseidon vs Bryan | 10–15 | 40.00% |
| Poseidon vs Jin | 10–14 | 41.67% |
| Poseidon vs Reina | 10–12 | 45.45% |
| Poseidon vs Dragunov | 8–7 | 53.33% |
| Poseidon vs Lars | 3–12 | 20.00% |
| Poseidon vs Jun | 6–8 | 42.86% |
| Poseidon vs Steve | 8–5 | 61.54% |
| Poseidon vs Victor | 7–6 | 53.85% |
| Poseidon vs Law | 4–8 | 33.33% |
| Poseidon vs Yoshimitsu | 2–8 | 20.00% |
| Poseidon vs Devil Jin | 6–4 | 60.00% |
| Poseidon vs Nina | 5–5 | 50.00% |
| Poseidon vs Eddy | 0–10 | 0.00% |
| Poseidon vs Lidia | 7–3 | 70.00% |
| Poseidon vs Asuka | 3–6 | 33.33% |
| Poseidon vs Leroy | 5–4 | 55.56% |
| Poseidon vs Xiaoyu | 5–3 | 62.50% |
| Poseidon vs Leo | 2–6 | 25.00% |
| Poseidon vs Clive | 4–3 | 57.14% |
| Poseidon vs Paul | 1–5 | 16.67% |
| Poseidon vs Lee | 2–4 | 33.33% |
| Poseidon vs Azucena | 4–2 | 66.67% |
| Poseidon vs Miary Zo | 4–1 | 80.00% |
| Poseidon vs Alisa | 2–2 | 50.00% |
| Poseidon vs Kazuya | 2–1 | 66.67% |
| Poseidon vs Jack-8 | 1–2 | 33.33% |
| Poseidon vs Kuma | 1–2 | 33.33% |
| Poseidon vs Feng | 0–2 | 0.00% |
| Poseidon vs Lili | 1–1 | 50.00% |
| Poseidon vs Armor King | 2–0 | 100.00% |
| Poseidon vs Shaheen | 1–0 | 100.00% |
| Poseidon vs Raven | 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.