I have way too many favorites tbh. Most of my top favorites are from YW2 onwards and as such,you may not recognise them haha. So my favorites that already were shown in YW1: Venoct, Chansin and his evos, Benkei, Snartle, Casanuva and... Everfore i think... YW1 has good section of yokais ,its just that a lot of my faves are from YW2/busters/3
Edit: cant believe I forgot Dimmy,Hidabat, Spenp, Heheheel /croonger, Copperled and a few others