If Eileen comes to DOA6 we're all screwed LOL! Moe battles with Marie/Honoka/NiCO. Just gimme some Jacky action TN/SEGA YEAHHH!!!
Her mixups would be crazy in DOA terms. Besides, originally they wanted her and Aoi in DoA5 as guests but decided on the more iconic that time.
Most of the VF characters would be tight in DOA. Vanessa, Goh, Jean, Brad etc. would be beastly in DOA6's engine.