There does appear to be a fairly large adult male following for MLP; I have this from a mate who is something of an otaku, and watches, and can talk at some considerable length on, lots of Japanese Animé, much of it downloaded from fan sites, because it's not even been released on disc.
The only ones I'm familiar with are Girls Unt Panzer, (Schoolgirls who fight tank battles in old tanks), and Kin-Iro Mosaic, because a good friend of mine's house is used in the first episode as the home of Alice Cartalet, an English schoolgirl befriended by the main Japanese character, Shino.
She even has her split-screen Morris Minor featured, too!
She's now getting lots of bookings from rather distracted Japanese men with damp handshakes...
...I did try to warn her.