Arabella Figg is a character from the Harry Potter series who starts with the letter F. She is a Squib, meaning she is born to wizarding parents but does not possess any magical abilities herself. Arabella is a neighbour of the Dursleys, the family that Harry Potter lives with before he discovers his magical heritage. She is also a member of the Order of the Phoenix, a secret organization of wizards and witches dedicated to protecting the wizarding world from Lord Voldemort and his Death Eaters.

Arabella is described as a kindly old woman who loves cats and has a fondness for knitting. She is known to have a rather eccentric personality, and is often seen wearing a pink dressing gown and a matching hat. She is also a loyal friend to Harry, and is willing to help him in any way she can.

Another Harry Potter character who starts with the letter F is Argus Filch. He is a Squib, like Arabella, and is the caretaker of Hogwarts School of Witchcraft and Wizardry. He is a strict and often irritable man, and is known to be quite strict with the students of Hogwarts. He is also known to be quite fond of his cat, Mrs. Norris, and is often seen carrying her around with him.

Argus is a loyal servant of Hogwarts, and is willing to do whatever it takes to protect the school from any harm. He is also known to be quite fond of magical artifacts, and often keeps them in his office.

Both Arabella Figg and Argus Filch are important characters in the Harry Potter series, and both start with the letter F. Arabella is a kind and loyal friend to Harry, while Argus is a strict and loyal servant of Hogwarts. Both characters play an important role in the series, and are integral to the story.