Hopefully with Nao's inclusion we will see Lian Shi
Who not only has a more rockin rack than nao nao but also has a more regal-motherly-wife-Milfy personality, an archetype which DOA is missing.
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Unfortunately, from what I've see nao is just another honoka, which between her and hitomi, cuteness is covered and so adds nothing new to the game character wise.
Also I hope these guests stay for DOA6, just say phase 4 abducted them from an alternate history since she was lonely and broody and wanted company lol. Could also be used to help phase 4 from being killed by the ninja clans as well.