迪安·汤玛斯（又称丁·汤玛斯）是一位格兰芬多学院的学生，特别擅长绘画和伪造签字。他和哈利·波特、罗恩·韦斯莱、纳威·隆巴顿、与西莫·斐尼干同住在一间寝室，则他是西莫·斐尼干最好的朋友。
迪安出生于一个麻瓜（不会魔法的人）的家庭。, evidenced by his being a fan of the football team West Ham United. Having no clue about which courses to choose for his third year, he simply closed his eyes and pointed his wand at the list. JKR revealed on her website that Dean was raised by his mother and stepfather, because his original father left the family when he was young. Dean was raised with a number of half-brothers and sisters. When Dean got the letter inviting him to Hogwarts, his mother wondered if his father had been a wizard. The truth, which they never discovered, is that Dean's father was killed by Death Eaters when he refused to join them. Dean was set to learn this information throughout his school career, but Rowling scrapped it in an early draft of Chamber of Secrets.
"I suppose in some ways I sacrificed Dean's voyage of discovery for Neville's, which is more important to the central plot."
Although this information has never appeared in the actual novels, it is considered canon because it has been mentioned on JKR's official website.
虽然迪安是西莫·斐尼干的最好的朋友，但是迪安并不喜欢西莫，在五年级的时候，迪安相信哈利·波特所说的伏地魔已经回来的话，而且他也是邓布利多军的一员。他认为在他们那一年级，帕瓦蒂·帕蒂尔与帕德马·帕蒂尔这对双胞胎是最漂亮的女孩。
在哈利·波特与凤凰社的最后，他开始与金妮·韦斯莱交往，然而，他们两个在哈利·波特与“混血王子”结束之前就分手了。根据赫敏·格兰杰的说法是， According to Hermione, their relationship had been "a bit rocky for ages" but the final break-up was supposedly triggered by a misunderstanding instigated by Felix Felicis drunk by Harry Potter, who starts fancying Ginny in HBP.
In Harry Potter and the Half-Blood Prince Dean also becomes a reserve Chaser after Katie Bell's accident with the necklace.
Some have speculated that Dean Thomas was named after the Forest of Dean, which, like many names in the Harry Potter series, lies in the county of Rowling's birth, Gloucestershire.
He is played by Alfie Enoch in the Harry Potter movies.
取自"http://zh.wikipedia.org/w/index.php?title=%E4%B8%81%C2%B7%E6%B9%AF%E7%91%AA%E6%96%AF&variant=zh-cn"
