Re: Friends Noticing Possession, Mind Control, general influence
The most detailed rules for this can be found in Detecting Psi (GURPS Psionic Powers, pp. 11-12):
"If the subject describes his pain or begins acting 'funny' (which requires a Psychology or Observation roll to notice, modified for behavior and for how well one knows the subject), a trained observer can roll to realize what's going on, as above, at a -4 penalty." The rules for that actual roll (the second one, made at -4) are too in-depth to reproduce here, but they basically boil down to a Per or Per-based Expert Skill (Psionics) roll, at a modifier based on exactly what's going on.
Note that the rules work well for any subtle, personality-affecting ability -- it's just that psi is the most common umbrella under which such abilities gather.
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Reverend Pee Kitty of the Order Malkavian-Dobbsian (Twitter) (LJ)
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