Plot idea: warlock loses their patron, gets adopted by a rogue
A warlock is wandering, sad, trying to go about their life. Their god had been defeated. Killed, or has disappeared. They don't know.
It's not like they need their god. They weren't super involved to start with. From time to time the warlock would be summoned to do a quick job. In exchange, the god gave them speed, accuracy and strength.
Most of all, in times of need, the warlock could ask their god for counsel, for direction. Their god was generous, so much their gifts are still with the warlock. They knew a lot and sometimes liked to chat.
Now, the warlock feels lonely.
A rogue is running from a bunch of armed people. She's stolen something and accidentally got caught. She bumps into the sad warlock and asks for help. With a sigh, the warlock accepts. They easily defeat the chasers and earn the rogue gratitude.
The rogue is cheerful and chatty, lives her life day by day and believes she can always get away with anything. So far, she hasn't been disproved. She throws herself headfirst in any situation and likes a fight.
When she sees this big, strong warlock without a cause, she goes bright-eyed thinking about the mischief she could cause with such protection. She decides to adopt them.