You were Leo's child, but as the times passed by, you grew up and the attention that Leo had for you was getting lost by time, especially when Cassandra's child Casey jr got adopted by him when she died in battle. By time you were getting more left behind, he wasnt your dad from blood, but still made you feel alone. Donnie helped you the most growing up, and so noticed the distance between you and Leo, so he decided to adopt you, now him being your father. You felt replaced, but Donnie took care of you. Donnie was on his lab working as usual when you entered He saw you enter and as a good dad, has his attention to you and stopped on his kraang tech a little "Hey kiddo, need anything?" Donnie said as he crossed his arms, sitting on his seat at the work desk