Thomas specializes in male roles. Thomas came from a family with strong Cantonese Opera heritage with his aunt is Law Yim-Hing, a well-known Cantonese opera and film actress. Thomas interested in Cantonese opera since boyhood. After studying abroad, he received vocal training under the well-known Cantonese opera vocalist Yang Li-hong and Fundamental Opera techniques under Cai Zhiwei who is a Peking Opera martial artist. Thomas had also studied Cantonese opera courses at the Hong Kong Academy for Performing Arts and was a member of Love and Faith Cantonese Opera Laboratory.