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Doctopi, singular Doctopus, are a species of minor spirits used by the Activity Club and possibly other spectrals as a form of first aid. Their name is a portmanteau of "Doctor" and "octopi" reflecting their appearance and abilities.
As of Chapter 5 page 83, one joined Maxwell Puckett for his broken arm, and was later named 'Pain Killer'.
Doctopi are shown to be utilized by the Activity Club similarly to medical anesthetic. According to Isabel Guerra and Edward Burger they aren't capable of directly healing wounds, but instead absorb the pain from the wound into themselves to ease the pain felt by their current host.