Throughout the series Nairobi is shown to be in love with her partner Helsinki, however, both never get to anything in particular because he is gay, although they end up being very good friends. Their friendship becomes very close, to the point of deciding to travel together around the world after the robbery of the Royal Mint, in addition to nickname him "osito" (little teddy) as a sign of affection. Helsinki is severely affected when she is murdered, but with the help of Palermo, he manages to appease the anger and sadness that triggers in him after her death.
