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Page 230 of the Core Rulebook at the start of the powers listings reminds the reader that all powers are by default targeting self or adjacent combatant. That means any possession power can be self-targeted. This includes both actives and passives.
No, it states that if the effect doesn't state a recipient then the default is Allies. Either self or Allies in range.
After going through the active powers it seems the only ones that a Seithkona can use to self inflict possession are 'the nightman cometh' or 'soul abortion'. They seem to have no access to the latter though (at least at low levels).