Kevin Sussman as Stuart Bloom
Who could forget the infamous owner of The Comic Center of Pasadena which has been a regular set for the four main characters. Stuart Bloom, who was played by Kevin Sussman was promoted to series regular after season six. Apart from his role in TBBT, Sussman is also known for his role as Walter from Ugly Betty.
Alessandra Torresani as Claire
Alessandra Torresani, who portrays Claire in the series, dates Raj for a bit. Though it didn’t go well, as well. Before The Big Bang Theory, Torresani also appeared on JAG, ER, CSI: Crime Scene Investigation, Lucifer, and Husbands. Apart from acting, the 30-year old actress is a black belter in taekwondo.