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The True Spirit Ability of a Nature Shaman is Companion Animal:
Companion Animal (Su): The shaman’s spirit animal takes the form of an animal companion of her choice, using her shaman level as her effective druid level. The animal retains all the special abilities and the Intelligence score of the spirit animal, but also has the statistics and abilities of an animal companion. If the animal is dismissed, is lost, or dies, it can be replaced in the same way as a normal spirit animal.
My shaman will have a sprite as an improved familiar, and I'm fond of the aesthetics of having a sprite. Now, the sprite's Luminous special abilities would stay in its new form, which is neat, but could I toggle the form on and off at will?
(Since the familiar itself is an Ex ability, and the Companion Animal effect is an Su ability, I'm sure I could use some sort of personal-antimagic or something to suppress the effect when desired, but that's a lot of thought and effort that hopefully I don't have to brainstorm up.)