Dr. Gillian

Dr. Gillian is a character from Phineas and Ferb and is a minor antagonist in the first season of The Knights of the Multiverse. He is a botanist, and was formerly a member of the evil organization L.O.S.R. but decided to abandon the group after the events of the previous summer.

Personality
At one point in his life, Gillian was probably just as mad and twisted as the rest of his old compatriots. However, after the incident at the end of last summer, he finally saw reason and realized the harm they could cause to the planet, so when he escaped along with the rest of the organization members, he chose to excommunicate himself from them, deciding instead to focus his time on bettering his research and raising his daughter in peace.

Flora
Unlike most of the L.O.S.R. scientists, Gillian cares a lot about his creation, raising Flora as his own daughter. Even before he saw reason, he still loved her greatly.