I think for the most part you are probably right. I don't know anything about Ram and Rom, but Iona was a decent pick for loli. Loli characters tend to be around moe characters quite a bit of the time, and will (almost) always be a junior (I've seen a few exceptions). They can also be a hybrid loli/moe character, and often times are. Also, almost all school anime have a loli in it. Examples:
Azusa from K-On
Makina from Grisaia
Moe characters are probably harder to point out, but I would say alot of it has to do with the drawing style. In that since, moe characters are grouped together quite frequently. There are a few anime that have all moe characters such as K-On, Girls und Panzer, and Non non Biyori.
Hotaru from Non Non Biyori
Miho and Saori from Girls und Panzer