| Happy Undies vs Reina | 63–47 | 57.27% |
| Happy Undies vs Kazuya | 38–63 | 37.62% |
| Happy Undies vs Jin | 41–48 | 46.07% |
| Happy Undies vs Hwoarang | 37–46 | 44.58% |
| Happy Undies vs King | 41–41 | 50.00% |
| Happy Undies vs Steve | 48–31 | 60.76% |
| Happy Undies vs Asuka | 28–34 | 45.16% |
| Happy Undies vs Bryan | 22–37 | 37.29% |
| Happy Undies vs Lili | 20–37 | 35.09% |
| Happy Undies vs Eddy | 23–30 | 43.40% |
| Happy Undies vs Azucena | 21–22 | 48.84% |
| Happy Undies vs Lee | 15–26 | 36.59% |
| Happy Undies vs Law | 19–21 | 47.50% |
| Happy Undies vs Jun | 25–15 | 62.50% |
| Happy Undies vs Paul | 15–24 | 38.46% |
| Happy Undies vs Xiaoyu | 18–21 | 46.15% |
| Happy Undies vs Dragunov | 19–20 | 48.72% |
| Happy Undies vs Kuma | 12–25 | 32.43% |
| Happy Undies vs Leroy | 16–18 | 47.06% |
| Happy Undies vs Leo | 7–24 | 22.58% |
| Happy Undies vs Lars | 10–21 | 32.26% |
| Happy Undies vs Feng | 14–16 | 46.67% |
| Happy Undies vs Yoshimitsu | 12–16 | 42.86% |
| Happy Undies vs Jack-8 | 10–15 | 40.00% |
| Happy Undies vs Claudio | 11–12 | 47.83% |
| Happy Undies vs Heihachi | 8–14 | 36.36% |
| Happy Undies vs Nina | 13–8 | 61.90% |
| Happy Undies vs Victor | 11–10 | 52.38% |
| Happy Undies vs Devil Jin | 8–11 | 42.11% |
| Happy Undies vs Raven | 6–12 | 33.33% |
| Happy Undies vs Lidia | 4–13 | 23.53% |
| Happy Undies vs Alisa | 1–10 | 9.09% |
| Happy Undies vs Shaheen | 4–5 | 44.44% |
| Happy Undies vs Clive | 1–6 | 14.29% |
| Happy Undies vs Panda | 2–4 | 33.33% |
| Happy Undies vs Zafina | 1–4 | 20.00% |
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.