David usually spent most of his time in the karate classes. So he was solely grown up with the peoples like Tommy Williams and Bill Wallace the guys who were having full contact with karate. And from that time he wanted to become champions of champions. He got his nickname Thunder from Bill Packer after the Japanese nicknamed him Iron tsunami. Thunder's family was too supportive of his dream of becoming a champion. So his mom and dad usually spend their weekends driving him from one competition to another.