DOA5 tag animations be on some weirdness, Helena and Gen fu lost their tag intro/outro and characters who never interacted (as far as we know) all are chummy, the curse of being DLC after the story was done
DOA6 also completely forgot Eliot x Ayane/Eliot x Christie and tried to push Hitomi on him... its nowhere the same as Christie cockteasing him or Ayane being tsun yet Hitomi gaos at him once as a joke and DOA6 shipping