| MarioParty8 vs Kazuya | 255–204 | 55.56% |
| MarioParty8 vs Dragunov | 265–148 | 64.16% |
| MarioParty8 vs Lee | 222–191 | 53.75% |
| MarioParty8 vs Bryan | 245–130 | 65.33% |
| MarioParty8 vs Jin | 219–142 | 60.66% |
| MarioParty8 vs King | 208–149 | 58.26% |
| MarioParty8 vs Hwoarang | 197–156 | 55.81% |
| MarioParty8 vs Devil Jin | 197–124 | 61.37% |
| MarioParty8 vs Steve | 164–134 | 55.03% |
| MarioParty8 vs Yoshimitsu | 142–155 | 47.81% |
| MarioParty8 vs Reina | 184–100 | 64.79% |
| MarioParty8 vs Law | 130–129 | 50.19% |
| MarioParty8 vs Lars | 129–129 | 50.00% |
| MarioParty8 vs Jun | 143–113 | 55.86% |
| MarioParty8 vs Nina | 128–123 | 51.00% |
| MarioParty8 vs Lili | 123–109 | 53.02% |
| MarioParty8 vs Paul | 138–87 | 61.33% |
| MarioParty8 vs Asuka | 113–108 | 51.13% |
| MarioParty8 vs Feng | 116–105 | 52.49% |
| MarioParty8 vs Shaheen | 106–90 | 54.08% |
| MarioParty8 vs Heihachi | 99–95 | 51.03% |
| MarioParty8 vs Raven | 96–96 | 50.00% |
| MarioParty8 vs Zafina | 131–53 | 71.20% |
| MarioParty8 vs Xiaoyu | 75–95 | 44.12% |
| MarioParty8 vs Victor | 83–82 | 50.30% |
| MarioParty8 vs Alisa | 75–86 | 46.58% |
| MarioParty8 vs Leroy | 62–94 | 39.74% |
| MarioParty8 vs Azucena | 90–64 | 58.44% |
| MarioParty8 vs Lidia | 86–68 | 55.84% |
| MarioParty8 vs Jack-8 | 84–69 | 54.90% |
| MarioParty8 vs Leo | 73–67 | 52.14% |
| MarioParty8 vs Clive | 66–70 | 48.53% |
| MarioParty8 vs Kuma | 68–63 | 51.91% |
| MarioParty8 vs Claudio | 69–60 | 53.49% |
| MarioParty8 vs Eddy | 42–37 | 53.16% |
| MarioParty8 vs Armor King | 17–14 | 54.84% |
| MarioParty8 vs Panda | 14–14 | 50.00% |
| MarioParty8 vs Anna | 14–8 | 63.64% |
| MarioParty8 vs Miary Zo | 8–4 | 66.67% |
| MarioParty8 vs Fahkumram | 5–5 | 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.