So in short: Isekai. Let's see...
Isekai Progenitors: Arata Kangatari, Digimon Adventures, Fushigi Yuugi, InuYasha, Magic Knight Rayearth, MAR (Anzai Nobuyuki), Tenkuu no Escaflowne, Suijin no Hanayome, Tsubasa Reservoir Chronicles
Seinen: Genjitsushugisha no Oukokukaizouki (a bit of harem), Kumo Desu ga, Nani ka?, Log Horizon, Realist Maou Niyoru Seiiki Naki Isekai Kaikaku, Saihate no Paladin, The Wolf Won't Sleep
Comedy/Slice-of-Life: Hataraku Maousama!, Isekai Izakaya "Nobu", Isekai Transporter, The Ride-On King
Ecchi: Kekkon Yubiwa Monogatari, Meikyuu Black Company, Shinju no Nectar, The World of Moral Reversal
Famous ones: Konosuba and the spinoffs (especially Vanir's spinoff), No Game No Life, Overlord, Re:Zero, Youjo Senki
Not really my taste, but maybe you'll like it?: Alice in Borderland, Cage of Eden
(All of them are certified good shit in my book. Check 'em out)