i would say chocobo only with chocobo breeding/rasing to custumize look and chocobo gear made by crafters that can give your chocobo a boost. there is no need for dodos or marmot mounts, just make chocobos fun and customizable

imagine, black chocobo with White gold plate armor +3 ( yeah +3 makes it shiny) or cloth armor or leather, gear your chocobo to match your class ^.^
also the more a chocobo runs the gear wears and you need to fix it!..... O.o!