I'm sure most would be like me and would want to see the pairings with the most "animosity" between them such as Luke and Kota, Asterion and Niko, Pedro and Niko. I'm not sure how the MC's actions would affect Nikos' presences at the hotel post chapter 18 but a match referencing Nikos rematching with whoever wrestled the wine bottle from Argos if the MC failed the task could be part of that. A former Foreman and a prosecutor, some tension there maybe?
Themba and Robert could make a fun battle of the titans considering their sizes. Asterion with Themba, Oscar and the Cobalts with his uncle/paternal relationship with them would be fun for me to read. The MC and Pedro as player and thematic player surrogate could lead to an opportunity for sneaky meta commentary.
Would anyone be brave enough to want to wrestle with a wolf? I sense a hilarious scenario involving Khenbish's bad luck losing to him. There's always the eternal struggle between canine and (half) feline too. If Robert wrestles Wolf, I hope he doesn't forget to not wear his prosecutor outfit.