Beasts reidevas naturally look like beasts and can be captured easily. They behave like normal animals as well.
Angel-like reidevas look like humans but they are either more holier or more eviler and they have wings. Whatever it is, you cannot just defeat and capture them. You will have to gain their friendship and trust, regardless whether you defeat them or not. You'll have to be worthy of a great tamer in their eyes.
Humaniods are basically human-shaped reidevas that cannot be captured. Both the Guardian Force and X do not know they are actually reidevas. These humaniods are just like humans of the reideva world and can be tamers. Fairies, elves, demons, etc can be classified under humaniods but are the more superior ones cause most of them has special abilities and even powers.
Holy reidevas are very powerful and have supreme control over the reideva world such as the demi-gods, the 4 holy beasts and the 10 ancient protectors.
God-like reidevas are usually those evil or corrupted ones who want absolute control over the UU. They do not like to be refer as 'holy' so they called themselves 'god-like'. Examples are the 12 beast assasins who want to take over the place of the 10 ancient protectors.
