There's so many good blue villagers honestly! My top favs would be Ione and Hornsby, i had hornsby for a while and let him go but maybe id bring him back in another game, and ione I wanna try out in my town soon
Some honorable mentions would be Bam, Julian, Sherb and Dizzy (who's kindof blue kindof grey)
julian was my first ever dreamy so i have a soft spot for him and his fabulous self i also really liked bam when he was in my town and filbert is just super duper cute