25. Emiko Adachi
Oliver Queen’s other sister (whom he had no knowledge of) showed up rather late in the Arrowverse game, as she terrorized Star City throughout Arrow Season 7 as part of the diabolically villainous Ninth Circle. Though there were pacing problems with Emiko Adachi’s narrative, it became clear that the estranged daughter of Robert Queen wanted to exact revenge for her mother’s death on the people of Star City and, more importantly, Oliver.
It all came to a head in a battle between the two in the season finale. Well, that is until they were interrupted by the Ninth Circle’s new leader, Beatrice, who had enough of Emiko’s personal vendetta with the Queens. Though this ironically resulted in the estranged siblings uniting to take on the Circle, Emiko was killed in the fallout. However, in one last moment of redemption, she apologized to Oliver and attempted to make amends with him.
While the whole thing ended up feeling a little rushed, it was really tragic that Emiko never got to experience the love that her brother was willing to give her – and that it took something as irreversible as death to make her realize her wrongdoings.
Oh Emiko, things could have been so, so different.