I don't expect anyone to get this so here is the answer:

Brazilian Jaque Mourão (female) - in mountain biking at Tokyo 2020 (in 2021) and cross-country skiing at Beijing 2022.

Japan’s Ayumu Hirano (male) - in skateboarding at Tokyo 2020 (in 2021) and snowboarding at Beijing… https://t.co/zR8m2IaCCa

— Bill Mallon (@bambam1729) January 23, 2024