Honestly, all the PC races other than Human, Elf, and Dwarf are underrepresented. (And I challenge you to find a female dwarf spellcaster before this set.)
Let's just take Dragonborn, Deva, Shardmind, Wilden, Genasi, Mul, and Thri-kreen as the most unrepresented. For me to do a caster/warrior...