Three is a very small number. But if I have to choose only three, maybe it could be like that.
3 events in Tokyo - 1. M high jump 2. W high jump 3. M pole vault
3 countries to cheer on - hmmm.. probably but I rather cheer on favourite athletes from very different NOCs and I like different teams in different team sports actually
3 favourite olympians
Artur Partyka, high jump, bronze in Barcelona 1992, silver in Atlanta 1996
Yulia Lipnitskaya, figure skating, mainly because of Sochi Schindler's list performance in team event
Arkadiusz Gołaś, volleyball, member of Athens 2004 team, great talent with probably huge career in front of him, but he got killed in car accident in 2005 when only 24 years old