From Resident Evil.Ada's past life before 1998 is a complete mystery. Her ethnicity and nationality are left unconfirmed, and when and where she was born are also unknown.Even her birth name is not believed to be real.In RE 2, she met Leon Kennedy and developed feelings for him.Despite this, she would use him on many occasions. Won't admit her feelings for him.In Spain, (RE 4) She worked under Wesker to retrieve a sample of Las Plagas.She also reunited and helped Leon.Betrayed Wesker.