Ya usually threads happen when players cross to challengers but if you want go ahead.
Fan list: Cilic, Federer, Dodig
Like/respect list: Nadal (every Federer fan should respect him and vice versa), Ferrer, Soderling, Kohlschreiber, Karlovic, Almagro, Nishikori, Dolgopolov
P.S. Watch out for Donna Vekic and Borna Coric, 2020. Hopman cup winners.