Robots/Androids: The only friendly machine is RFS-81. Kill all the others.

Rynjin: They are almost always hostile; the few that are not, are hostile when you get close to them. Again, kill them all.

Rattkin: These can be divided into Rattkin Razuka, and Rattkin Common

Rattkin Razuka: These are only 3 members: Rattus Rattus, Milano Calzone, and Don Barlone. You could kill all 3, getting the Astral Domanae for free, while clearing the 6th Bough of all Rattkin.

Rattkin Common: These are the Rattkin Breeders, as well as all other generic Rattkin thugs wandering around the Trynnie's 6th Bough. Whack them all, as you would all other monsters.

Rapax: There are many hostile Rapax, however, there are a few good ones.

Arnika: Antone Rapax has a bad attitude; Despite this, he will sell mid-game items to the party (I believe that he is alligned with the Higardi faction).

Rapax Away Camp: The Rapax Queen is locked up. When you open her cage, she is friendly to the party.

Rapax Rift: Rafe, as well as 3 other generic Rapax (locked up), are friendly to the party. The former gives you a quest.

Rapax Castle Main Level: Ferro (best vendor in the game), and Al-Adryian (quest giver), are friendly.

Rapax Castle Basement: This is not that important, but some of the drunk Rapax, and the Rapax Constable, are friendly to the party.