@olafurp@lemmy.world has been putting together a list

• Top left: Astolfo (Fate) identifies as a man

• Top middle: Felix (Re:Zero), male

• Top right: Saika Totsuka (My Romantic Teen SNAFU), male

• Middle middle: Rimuru (Reincarnated as a Slime), was male before

• Middle right: Hideyoshi Kinoshita (Baka and Test), male

• Bottom left: Hayate (Hayate, Combat Butler), male