| I'm a Dumb455 vs Reina | 42–25 | 62.69% |
| I'm a Dumb455 vs Eddy | 22–24 | 47.83% |
| I'm a Dumb455 vs King | 23–22 | 51.11% |
| I'm a Dumb455 vs Bryan | 23–18 | 56.10% |
| I'm a Dumb455 vs Jin | 17–22 | 43.59% |
| I'm a Dumb455 vs Kazuya | 16–21 | 43.24% |
| I'm a Dumb455 vs Yoshimitsu | 15–16 | 48.39% |
| I'm a Dumb455 vs Azucena | 15–15 | 50.00% |
| I'm a Dumb455 vs Lili | 13–15 | 46.43% |
| I'm a Dumb455 vs Jun | 14–14 | 50.00% |
| I'm a Dumb455 vs Law | 12–15 | 44.44% |
| I'm a Dumb455 vs Paul | 16–9 | 64.00% |
| I'm a Dumb455 vs Dragunov | 10–13 | 43.48% |
| I'm a Dumb455 vs Jack-8 | 7–15 | 31.82% |
| I'm a Dumb455 vs Hwoarang | 9–10 | 47.37% |
| I'm a Dumb455 vs Heihachi | 9–8 | 52.94% |
| I'm a Dumb455 vs Xiaoyu | 10–6 | 62.50% |
| I'm a Dumb455 vs Asuka | 9–7 | 56.25% |
| I'm a Dumb455 vs Lee | 9–7 | 56.25% |
| I'm a Dumb455 vs Lidia | 4–12 | 25.00% |
| I'm a Dumb455 vs Steve | 8–7 | 53.33% |
| I'm a Dumb455 vs Lars | 4–10 | 28.57% |
| I'm a Dumb455 vs Leroy | 4–10 | 28.57% |
| I'm a Dumb455 vs Clive | 7–4 | 63.64% |
| I'm a Dumb455 vs Leo | 5–5 | 50.00% |
| I'm a Dumb455 vs Nina | 5–5 | 50.00% |
| I'm a Dumb455 vs Victor | 6–4 | 60.00% |
| I'm a Dumb455 vs Devil Jin | 5–4 | 55.56% |
| I'm a Dumb455 vs Shaheen | 5–4 | 55.56% |
| I'm a Dumb455 vs Feng | 2–6 | 25.00% |
| I'm a Dumb455 vs Alisa | 4–4 | 50.00% |
| I'm a Dumb455 vs Raven | 5–3 | 62.50% |
| I'm a Dumb455 vs Armor King | 5–2 | 71.43% |
| I'm a Dumb455 vs Kuma | 1–5 | 16.67% |
| I'm a Dumb455 vs Claudio | 2–3 | 40.00% |
| I'm a Dumb455 vs Zafina | 1–3 | 25.00% |
| I'm a Dumb455 vs Miary Zo | 2–2 | 50.00% |
| I'm a Dumb455 vs Fahkumram | 1–2 | 33.33% |
| I'm a Dumb455 vs Anna | 2–0 | 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.