A bomber who goes by the nickname, the Trump Bomber (known as Playing Card Bomber in the English version of the manga).
The bomber's third attack at the Domino Mall killed eight people. His fourth threatens Mazaki Anzu's life. Dark Yugi saved her life by playing clock solitaire without getting four threes. Afterwards, Dark Yugi revealed the location of the bomber to the police chief, leading to hsi arrest.
In the Toei anime, the bomber looks much older and is renamed to Continous Bomber. Also in the Toei anime, the bomber plays a game involving balloons, threatening the lives of people on a Ferris wheel, including Mazaki Anzu. When the game mandates that the bomber is supposed to kill himself, he refuses. Dark Yugi placed a Penalty Game on him, making him go berserk and causing him to fall out of his car. The bomber was then arrested by the police.
Content compiled by AnimeList.moe from publicly available sources.
