Author's Note:
Nothing is really known about Zero's mother other than she is a blue Ultra scientist. Zero didn't know about his father was Seven till he learnt that from Ultraman King, My belief is that Seven only watched him grow at a distance due to either Seven didn't have courage is ask her for marriage due to Zero, or they got married and then divorced for unknown reasons while Zero was too young to remember.
I named Zero's Mother Mindred during the Middle Earth Parts of the story while her other name is Korona (火霖, meaning:long rainy spell of fire).
Korona/Mindred is rather a naughty Ultra in my opinion with going behind Seven back by experimenting if an Ultra and man can reproduce. Well I guess I have to give it her for style in choosing fighting men . (would only choose to include Seven and Eomer fighting each other if the readers really want it.. )
Akira (光 meaning :light)/ Rowena is the product of Mindred and Eomer's one night stand. No chance in hell would she inherit of thrown of Rohan due to Eomer's marriage to Lothiriel. She has her mother's black hair and grey/silver eyes.