She has twin sisters named Daisy and Poppy.
She has appeared in every episode up to date, alongside Ben Elf.
She has two parents; King and Queen Thistle, who both care for everyone and take the role of the King and Queen of the Little Kingdom.
She has two younger twin sisters named Daisy and Poppy. They are both very mischievous when their wands and magic are involved between them. The only time when they behave properly is when their mother, Queen Thistle is around, who has the capability of confiscating their wands from them.
She has a best friend, who is Ben Elf. He is an elf of the same age as her. He wears blue clothing along with a blue elf hat, and black pants. He is sometimes unsure about fairy magic but encourages Holly to use magic, especially in urgent and desperate situations.
Nanny Plum is the Little Castle's maid. She is very close to Holly as she is known to be her 'babysitter'. She always has the enthusiasm of using magic spells, and doesn't really have a clue about how magic can always lead to wrong results. She is caring to other people, especially Holly, but can be fairly strict during approprate times.
Big - In "Big Ben and Holly".
Invisible - In "Queen Thistle's Teapot". First
Queen - Has a slightly larger crown with colourful spots like Queen Thistle's in "Queen Holly". Second
Rapunzel - Has longer hair in "The New Wand". Third
Jungle clothes - In "The Lost City". Eighth
Hard hats - At the Elf Factory and the Elf Farm. Second
Fox cub - In "Fox Cubs". Tenth
Warm clothes - In cold episodes. Seventh
Spacesuit - In "The Elf Rocket" and "Picnic On The Moon". Sixth
Light clothes - At hot areas. Fifth of Flash
Aprines - In "Queen Thistle's Teapot". Third
in the upcoming stage musical, the role will be played by Monique Young (Hairspray).