Helpful spirit

Definitions of spirits vary --- it can be either something embodied or disembodied, or something that switches between being embodied, or disembodied, or which inhabits a machine or whatever thing. For example in Zelda games the character Link has a fairy companion --- the correct way to understand this is that she seems like an embodied spirit, as any thing with a body, including you, me, and other 'humans' is an embodied spirit. The question of something being biologically bodied or otherwise bodied is also there.Gotheon
A rough sci-fi equivalent [of the spirit adviser] is the Virtual Ghost, though it is usually visible to anyone. Can be the result of ascending to a higher plane of existence.
See also: Waif Prophet, Warrior Poet, He Who Must Not Be Seen, Dead Person Conversation, Floating Advice Reminder, Multitasked Conversation, I See Them, Too, Non-Human Sidekick, Not-So-Imaginary Friend, Closer to Earth, Noble Savage, and Magical Guide. For the Science Fiction version, see Virtual Sidekick.tvtropes
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* Companion; Friend; Imaginary friend; Disembodied
* Servant
Secret friend