Just throwing this out there but is it possible to change a PC's portrait mid-game to signify a major change in the character's appearance and/or personality eg. (sorc/bard gains lvls in Red Dragon Disciple and sprouts wings, breathes fire etc.). While on the topic of RDD's, is there some kind of restriction on gaining RDD lvls?

You will have to app for any prestige class

http://www.escapefromunderdark.com/applications/

That, and changing the character portrait will probably require usage of Leto.

Description and portrait changes are rare, but they can happen in special circumstances. Red Dragon Disciple, as well as all of the other prestige classes, must be applied for.

Neat. Thanks for clearing that up for me.