Solitaire

A sixth former nicknamed Higgs who blogs, sleeps and keeps people at a distance, and gets pulled into the pranks of the group called Solitaire.

A new boy at Tori's school who becomes her ally as they try to unmask Solitaire.

Tori's younger brother, whose struggles weigh on her; he is also a lead of Heartstopper.

A schoolmate introduced here who goes on to co-lead Heartstopper with Charlie.