| Riannon vs Jin | 148–124 | 54.41% |
| Riannon vs Hwoarang | 104–124 | 45.61% |
| Riannon vs King | 134–86 | 60.91% |
| Riannon vs Kazuya | 126–79 | 61.46% |
| Riannon vs Bryan | 78–94 | 45.35% |
| Riannon vs Paul | 81–89 | 47.65% |
| Riannon vs Reina | 60–105 | 36.36% |
| Riannon vs Law | 72–85 | 45.86% |
| Riannon vs Yoshimitsu | 68–88 | 43.59% |
| Riannon vs Steve | 66–76 | 46.48% |
| Riannon vs Dragunov | 72–67 | 51.80% |
| Riannon vs Lili | 74–62 | 54.41% |
| Riannon vs Heihachi | 51–59 | 46.36% |
| Riannon vs Jun | 54–52 | 50.94% |
| Riannon vs Devil Jin | 50–51 | 49.50% |
| Riannon vs Asuka | 51–48 | 51.52% |
| Riannon vs Feng | 45–54 | 45.45% |
| Riannon vs Lars | 49–46 | 51.58% |
| Riannon vs Xiaoyu | 45–49 | 47.87% |
| Riannon vs Lee | 37–54 | 40.66% |
| Riannon vs Nina | 47–42 | 52.81% |
| Riannon vs Alisa | 43–31 | 58.11% |
| Riannon vs Azucena | 40–30 | 57.14% |
| Riannon vs Eddy | 27–40 | 40.30% |
| Riannon vs Leroy | 25–35 | 41.67% |
| Riannon vs Victor | 28–28 | 50.00% |
| Riannon vs Leo | 15–40 | 27.27% |
| Riannon vs Claudio | 23–24 | 48.94% |
| Riannon vs Armor King | 24–22 | 52.17% |
| Riannon vs Jack-8 | 25–19 | 56.82% |
| Riannon vs Lidia | 15–23 | 39.47% |
| Riannon vs Kuma | 13–24 | 35.14% |
| Riannon vs Raven | 15–22 | 40.54% |
| Riannon vs Clive | 10–17 | 37.04% |
| Riannon vs Zafina | 9–16 | 36.00% |
| Riannon vs Anna | 10–14 | 41.67% |
| Riannon vs Miary Zo | 9–14 | 39.13% |
| Riannon vs Shaheen | 6–15 | 28.57% |
| Riannon vs Panda | 5–8 | 38.46% |
| Riannon vs Fahkumram | 5–8 | 38.46% |
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.