Mary

Mary is one of Lucy's friends.

She's introduced on page 45 but her name isn't revealed until later, much like Lucy's mom. In Mary's case this didn't happen until season 2 when Lucy encourages Mary to introduce herself to Thomas.

She appears on page 65 playing with dolls. Chloe is alarmed when her mom says Lucy's "upstairs with a friend from school" thinking Lucy's bullying Thomas again, but it was just playing dolls with Mary.

On page 12 of season 2 she and Thomas' friend both observe Lucy's interactions with Thomas.

Lucy introduces Mary to Valerie on page 79.

In season 3 she and Tom are invited over.