Athletics is interesting. Currently we have three in women's pole vault (Stefanidi, Kyriakopoulou, Polak), one in men's long jump (Tentoglou), women's triple jump (Papachristou), and women's 20km walk (Drisbioti).
If we look at the rankings/Road to Tokyo, Douvalidis, Papamichail, Anastasakis, Frantzeskakis, Filippidis, Karalis and Tsiamis will all qualify from the men. I think Baniotis, Scarvelis, and Zikos also have decent chances. Baniotis has been injured and if he's healthy he shouldn't have a problem improving his ranking. Scarvelis had a big throw last year which didn't count for the rankings of course, and Zikos has done well in 60m and needs to replicate that in 100m to improve his ranking.
For the women, it looks like we will get three quotas in the 20km walk (Tsinopoulou and either Filtisakou or Papadopoulou in addition to Drisbioti). Also in qualifying positions right now are Anagnostopoulou, Scarvelis, Vasiliou, Pesiridou, and Spanoudaki. Belibasaki and Tzengko will surely qualify by entry standard if healthy (they currently don't have rankings because they didn't compete in enough events). Karydi also has a really good chance, either in the triple jump or long jump or both. And I wouldn't count out Pappas in the marathon, or one of our female high jumpers (Zakka or Gusin) or Kolokytha in the long jump. Our women's 4x400 team could be very good but they never have a full squad with both Belibasaki and Vasiliou in unfortunately, and they won't compete at the world relays either.
There are some girls who in 2016 I thought for sure would qualify for Tokyo. Iliana Korosidou, Anastasia Marinakou, Konstantina Romaiou, Tatiana Gusin, Panagiota Dosi, Dimitra Gnafaki, Haido Alexouli. Sadly many of these girls struggled in recent years. Also last time we had three female marathon runners in Rio, but now the standard is so difficult...
In the end, I think our Tokyo 2020 athletics team will look something like this:
Men: Douvalidis, Papamichail, Tentoglou, Filippidis, Karalis, Anastasakis, Frantzeskakis, Scarvelis, Tsiamis...maybe Baniotis or Zikos too.
Women: Spanoudaki, Belibasaki, Vasiliou, Pesiridou, Drisbioti, Tsinopoulou, Filtisakou, Stefanidi, Polak, Kyriakopoulou, Papachristou, Tzengko, Scarvelis, Anagnostopoulou...maybe Karydi or Zakka too.
I don't expect the others like Kolokytha, Zikos, Pappas etc to qualify at this point but I hope I am wrong.