Tellerian Hawke
Defender of Oerth
I have dealt with this problem before, in my epic game. Here's the approach I took:
Look at page 42 of the 3.5 PHB. Under the Monk ability, "Perfect Self."
It seems to indicate that the monk becomes a Native Type Outsider, because "...unlike other outsiders, the monk can still be brought back from the dead as if she were a member of her previous creature type."
But earlier in the description, it says: "She is forevermore treated as an Outsider (an extraplanar creature) rather than as a humanoid for the purpose of spells and magical effects. For instance, Charm Person does not affect her."
This would suggest, at least in my opinion, that the monk is an Outsider for the good and the bad; if the monk is immune to charm, then the monk is also subject to the hedging effects of Protection vs. Good, etc. The monk can also be banished.
How do you banish someone who is native to the Prime Material? Simple. Once you become an Outsider, your home plane is considered to be that of your patron deity. In the case of a monk, that would either be The Outlands (Xan Yae) or the good ol' Prime Material (Zuoken.) [I use Greyhawk, by the way.]
In my mind, the ability to be raised is because of the "humanoid spark" that still lies within the creature's soul.
However, the part of being an Outsider than gives them immunity to charm, is also the part that makes them banishable.
Thus, in my campaign, Thor's Chosen (who was once a mortal man, born on Oerth) who has become an Outsider by rising to Divine Rank 0 now considers Asgard his "home plane."
So, if Thor's Chosen is on the Prime, and someone banishes him, he goes back to Asgard. In fact, he appears in the outer gatehouse of the Rainbow Bridge, where Heimdall stands watch by the gates. Appearing there is round 1.
Then he bows and says, "Sorry to bother you, Heimy," as he begins casting Plane Shift. That's round 2. Then he returns to the Prime (round 3), and uses Teleport w/o Error to go back to the exact spot he was before he was banished (Round 4.)
On round 5, if the person who banished him is still there, he's in trouble
Of course, if your deity lives on the Prime (the way Fharlanghn and Zuoken do) then banishment simply fails when cast upon you while on the Prime.
And of course, for epics, banishment is little more than an inconvenience.
Look at page 42 of the 3.5 PHB. Under the Monk ability, "Perfect Self."
It seems to indicate that the monk becomes a Native Type Outsider, because "...unlike other outsiders, the monk can still be brought back from the dead as if she were a member of her previous creature type."
But earlier in the description, it says: "She is forevermore treated as an Outsider (an extraplanar creature) rather than as a humanoid for the purpose of spells and magical effects. For instance, Charm Person does not affect her."
This would suggest, at least in my opinion, that the monk is an Outsider for the good and the bad; if the monk is immune to charm, then the monk is also subject to the hedging effects of Protection vs. Good, etc. The monk can also be banished.
How do you banish someone who is native to the Prime Material? Simple. Once you become an Outsider, your home plane is considered to be that of your patron deity. In the case of a monk, that would either be The Outlands (Xan Yae) or the good ol' Prime Material (Zuoken.) [I use Greyhawk, by the way.]
In my mind, the ability to be raised is because of the "humanoid spark" that still lies within the creature's soul.
However, the part of being an Outsider than gives them immunity to charm, is also the part that makes them banishable.
Thus, in my campaign, Thor's Chosen (who was once a mortal man, born on Oerth) who has become an Outsider by rising to Divine Rank 0 now considers Asgard his "home plane."
So, if Thor's Chosen is on the Prime, and someone banishes him, he goes back to Asgard. In fact, he appears in the outer gatehouse of the Rainbow Bridge, where Heimdall stands watch by the gates. Appearing there is round 1.
Then he bows and says, "Sorry to bother you, Heimy," as he begins casting Plane Shift. That's round 2. Then he returns to the Prime (round 3), and uses Teleport w/o Error to go back to the exact spot he was before he was banished (Round 4.)
On round 5, if the person who banished him is still there, he's in trouble

Of course, if your deity lives on the Prime (the way Fharlanghn and Zuoken do) then banishment simply fails when cast upon you while on the Prime.
And of course, for epics, banishment is little more than an inconvenience.