I infrequently use real people as models for fictional characters when I read. Even Harry Potter, after all those movies, when I read, Harry and Ron and Hermione are not Daniel and Rupert and Emma. They are shadowy mind people who look and sound different.
The one exception in recent memory is Boots, from Suzanne Collins's first series Gregor the Overlander. Boots is Gregor's sister, and she is also my niece, Sadie.