What abilities remain with the body during possession?

[stormRunner47]

I currently am roleplaying a Samsaran Psychic with a focus on Necromancy, especially the possession spells.

On d20PFSRD, the Possession spell description states:

"You keep your Intelligence, Wisdom, Charisma, level, class, base attack bonus, base save bonuses, alignment, and mental abilities."

-and-

"The body retains its Strength, Dexterity, Constitution, hit points, natural abilities, and automatic abilities."

-and-

"You can’t activate the body’s extraordinary or supernatural abilities, nor can you cast any of its spells or spell-like abilities."

Most of this is clear except: "The body retains its...natural abilities and automatic abilities." How are these two things defined? Does it include all passive extraordinary and supernatural abilities, DR, Energy Resistance, Spell Resistance, Fast Healing, etc?

Also, how do feats work with Possession? What if the creature being possessed has Toughness? Does that still apply to the Hit Points of the body? What if the creature possessing has Toughness and the possessed creature does not--does the body gain hit points?

[Diego Rossi]

GM call generally, but a good rule of thumb is that if it work when the possessed creature is unconscious it stay with the body, if it require any kind of action, even a free one, it go away.
All the feats go away, but the effect of the feat stay if it change in a permanent way things that stay, like hit point.

A poisonous bite stay, grab probably go away as it is a mix of body shape and learned reflexes and so on. Too many abilities and variants (Ex, SU, SLA) to have a general rule that always applies.

[Terevalis Unctio of House Mysti]

What is the benefit then of possession?

[Volkard Abendroth]

Anything that is (EX) stays.

Passive abilities stay (DR, resistances, regeneration, fast healing, natural armor, etc.)

Natural attacks and movement types stay

Damage taken by the possessed body is not passed along to the caster.

There are plenty of benefits.

[Merm7th]

Terevalis Unctio of House Mysti wrote:

What is the benefit then of possession?

Whay do you mean? Everything stated above. You use the targets physical stats, HP, and body, you use your mental stats, skills, feats, and spells. You don't need line of effect or line of sight on the target, and it has a range of at least 130 feet. You take an enemy off the board and only threat to you is them finding where your body is hidden. If this is your plan, you have vanish or contingency vanish on hand to take care of your body.

[Diego Rossi]

Damage to the physical stat is received by the body, and you use the physical stats of the body. So a wizard possessing a Tyrannosaurus will have 153 hp, reach 20', a bite doing 4d6+2 and 32 str, dex 13 and con 19. He will surely lose improved critical, bleeding critical, critical focus, and all other feat, but it will retain the Tyrannosaurus SQ Powerful bite.
I wouldn't allow the Tyrannosaurus/wizard to use the grab ability but other GM could feel differently.