While it took sacrifices, Jonah kept his final form after Karolina was born in order to always be her father.
But before she can get away, Flores and AWOL arrive with the rest of the corrupt cops on PRIDE’s payroll.
Karolina goes through Jonah’s old office at the Church, where she finds an audio recording device that Jonah left for her.
Runaways season 2 episode 8 gives us some insight into Jonah’s solitary life waiting for Earth’s technology to reach a point where he could free his ship.