Right, something like Nyotengu as well. We know Bankotsubo won't return sadly but a direct influence to the character, thus Nyotengu. (The wind tornado, the throws etc.) Something like that.
Akira > New character - (Kokoro does not count as she is only paying homage to Akira because Akira was the first character to introduce Bajiquan to a 3D fighter. Kokoro is towards respect for that but unfortunately she plays nothing like Akira at all.) I speak of a character that plays almost the same as Akira but not exactly Akira. Could be male or female, doesn't matter. A true spiritual successor made as a DOA character with about the same type of data. (1-Frame Knee/Kick, GBoD, SPoD etc.)
Genra > New character - Genra itself might take the same path as mentioned. A new character inheriting the exact or changed movestyle of Genra.
Pai > New character. As
@KwonJigglypuff mentioned up there. Spiritual successor of Pai. There's no character that is paying homage to her either. Leifang does not even count for homage as her style is Tai Chi while Pai is Mízōngquán (Ensei-Ken). Female or male, does not matter.
Jacky (?) - We already have Jann Lee. If anything, there are some moves that Jann Lee could inherit from Jacky to be taken for use.
Sarah (?) - Mixed martial art so this is debatable.