Tom Tanaka is an old friend and senpai of Shizuo Heiwajima. He works as a debt collector, and later becomes Shizuo's employer. Tom is usually seen walking around in a suit, but his clothing and his hair don't make him look too formal. This is probably due to his job as a debt collector, which needs him to look sharp and business-like but not too polite and friendly, as he often confronts people. It is likely that he works as an underground debt collector, and not for something like a bank. The light novels state that he works for an online dating website. He generally has a sort of reserved, laid back personality, and as harsh as you might expect an underground debt collector to be. He is usually calm, and is able to calm Shizuo down and make him stop without angering him and incurring his wrath.
Durarara!!
In Tokyo's downtown district of Ikebukuro, amidst many strange rumors and warnings of anonymous gangs and dangerous occupants, one urban legend stands out above the rest—the existence of a headless "Black Rider" who is said to be seen driving a jet-black motorcycle through the city streets. Mikado Ryuugamine has always longed for the excitement of the city life, and an invitation from a childhood friend convinces him to move to Tokyo. Witnessing the Black Rider on his first day in the city, his wishes already seem to have been granted. But as supernatural events begin to occur, ordinary citizens like himself, along with Ikebukuro's most colorful inhabitants, are mixed up in the commotion breaking out in their city.
