Shadow Demon Magic Jar possession and SR

[DireMerc]

A shadow demon is possessing someone and they want to use dispel magic to try and force it out does the shadow demon Spell resistance apply?

What abut spells like magic missile?

[Firebug]

Well, dispel magic doesn't allow SR.
Magic jar does not say you keep your SR while possessing something. It does say

Magic Jar wrote:

... You keep your Intelligence, Wisdom, Charisma, level, class, base attack bonus, base save bonuses, alignment, and mental abilities. The body retains its Strength, Dexterity, Constitution, hit points, natural abilities, and automatic abilities.

So would you rule that SR is a mental, or automatic ability?

[DireMerc]

Hmm good catch on the dispel magic the player rolled to bypass SR and I didn't think to check if the spell needed SR or no just assumed it did.

Well SR could be considered an automatic ability?

I might just rule that spells that affect the demon need SR while spells that only affect the physical body don't need an Sr check.

[Plausible Pseudonym]

I would only apply the demon's SR to spells that target the demon's mind, like if you wanted to Charm Monster and ask it to vacate.

[Ascalaphus]

1) Dispel Magic doesn't allow SR.

2) In case you want to use other spells that allow SR against the possessed character/possessor: SR functions even if the owner is unconscious. So I'd say it's not a mental ability. Since during possession any ability should be coming either from host or invader but not both, and the host's SR is still going on, I'd say the invader's SR would not apply. Except perhaps against effects that directly target the invader (tend to be specialized effects).