Thomas and Michael Morhaime: A pair of twins, brown hair, blue eyes, square features. Michael wears his hair short, and Thomas’ comes down to his shoulders when it's not pulled up. 
The freshest legacy members of the Greenbriar Rogues, and mechanics in Springer Automotive, the shop that Audrey’s grandfather owns. 

Solomon and Padma Majumdar: another pair of twins, but these ones fraternal. Mixed ethnicity, with an Indian father and African American mother. Both parents work in energy technology. 
The twins are pretty hippy dippy, and both very concerned with environmental sciences. Solomon surfs, but Padma is afraid of the ocean. 
Both are on a fast track to a good college in California. 

Anthony Finch: in the same year as most of the characters. He is the oldest sickly baby from the lights eighteen years ago. He basically lived in hospitals until he was twelve, at which point his family just bit the bullet and brought the equipment he needed home, hiring a nurse to keep him alive. 
He attended school haltingly, and often had to leave in the middle of the day to rest. 


Some pretty basic info on background characters who will likely play roles in future events.