Of those: Kyou Kara Maoh is a proto-Isekai about a boy accidentally becoming a king and being surrounded by gorgeous men. I watched the anime some time ago, and enjoyed it. Konosuba is quite popular. From what I've been told, it's quite funny and isn't afraid to rip into the genre. Youjo Senki is great if you like amoral protagonists, magic realism, and are sick of swords-and-sorcery settings.