Bastila and Revan Fans: How would you want to have them back in KotOR III?

Well - we know Bastila had children so chances are it could have been with Revan.
I'd be very surprised if something of TORs story line doesn't revolve around Revan in some manner, if nothing else via quest messages.
But as for seeing Revan as a NPC in TOR? Very doubtful.

apparitions, or some kind of discovery of Force use that allows him to prolong his life, which he might use to complete a mission of some importance, like finding/fighting the True Sith.
i'd hate to be fighting for 300 years, though, lol

According to Star Wars lore, there are techniques which allow the user to prolong his life. Tho all are considered to be unholy and thus categorized under Sith Magic. Still, as Revan fell once to the dark side, i spose it wont be impossible. Tho I agree with Xandax on this; Revan wont be reappearing in TOR.

Everyone,Revan went off to find the 'True Sith' so he is out in a galaxy far,far away.......from you so basically Bastila appearing would be cool but Revan ......meh he's awesome but you know. Malak appearing as a ghost would be coolll tho. And on the case of Revan it would maybe be cool if you could see him as a crazy hermit or silent 'dark' wanderer an I know this is a late comment but I haven't seen the old republic out yet tho..