New answers tagged dragons
In addition to @tarkisflux answer, the draconomicon (page 166 & 167) provides a table of dragons that a half-dragon can be (all of which are specified as being true dragons). Though dragon disciples are not mentioned, dragon disciples are given the half-dragon template at level 10, implying that dragon disciples would have to choose from the same table.
I've been unable to find any official updates for the class (having looked through Dragon Magic, Draconomicon, and Races of the Dragon in addition to online sources), but I think you can make a few inferences from its design to find suitable additional dragons. The class fluff references 'dragons' at several points. Presumably, they refer to 'True Dragons' ...
Gary Gygax answered this question in an EN World interview, and at more length in Slayer's Guide to Dragons. Originally there were the five chromatic and evil dragons, each with a color that suited their breath weapon, and a sixth good dragon patterned on the Oriental model of that imaginary creature. As it was both or different origination and alignment ...
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