Castillon was born in Angers, France, to Benoît Castillon du Perron and Anne-Pascale Crèvecœur. She has two siblings. As a child, Castillon started making YouTube videos and had theatre training, though she did not consider that these two correlated with each other and did not intend to use YouTube for her career prospects. At the age of 15, with actress Léa Seydoux and some friends, she interviewed the Dalai Lama in Dharamshala, India
In 2018,Castillon met Matthieu Reynaud and formed Videoclub