Drampa is my favourite new addition. It's unbelievable how cute Drampa is in Pokemon Refresh. (and that special attack stat!)
Other families I love are the Rowlet, Cutiefly, Mudbray, Mareanie, Mimikyu, Wimpod and Dhelmise lines. (Also the Bruxish, Popplio and Dewpider lines are cool too, a lot of interesting water types this time around)
To be fair there aren't that many new families I feel badly about. I could have easily voted for more Pokemon if I didn't restrain myself.
By the way I feel like Ultra Beasts should be here since for all intents and purposes they are "Pokemon". I mean they have four moves, they have an ability, they have types, they're in the pokedex, what more do you want?