Era has an aetherial being that currently resides in some of her weapons - alive, but dormant atm - that had its own consciousness but not enough to classify it as its own character. It's about at the level of a daemon, actually.

When it is weak it can't make itself visible to others. Its current level of strength means it can show off its glowy angel-fairy form thing if it wants to, but it can only stay in close range of the weapon that can contain it... Unless it possesses its little wind-up doll soulstone minion thing.

Era spent weeks and weeks gathering aether, condensing it, meditating on her accomplishments to give it form and purpose. The end result was her wee aether elf child weapon thingy called an anima with the very original name of... Anima.

A list of all its dialogue is here. Its personality is similar to Era's, though it is significantly more quiet, preferring to observe and learn.