Tom Riddle was chosen to be in Slytherin because he already new dark arts without a wand.
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It isn't explicitly stated what Tom Riddle Junior (Lord Voldemort)'s favourite colour is in the novels, films or games of the Harry Potter series. However, as Tom Riddle was ridiculously proud of his Hogwarts House, and of being an ancestor of Salazar Slytherin, it can be very safely assumed that his favourite colours were those of Slytherin house: green and silver.
Yes he is a half-blood wizard. He was the son of Merope Gaunt, a pure-blood witch and a descendant of Salazar Slytherin and a muggle Tom Riddle Sr.
Rubeus Hagrid was in Gryffindor at Hogwarts School of Witchcraft and Wizardry. Hagrid was in the Gryffindor house.
Tom's mother was Merope Gaunt who was a squib. Her father was Marvolo Gaunt, who was the namesake of Tom's middle name. They were decsendents of Salazar Slytherin and Merope was disowned for using a love potion to make a muggle, Tom Riddle fall in love with her. Right after she had Tom jr. she ran out of love potion and Tom sr. left her.
Marvolo Gaunt's Ring Tom Riddle's Diary Helga Hufflepuff's Cup Salazar Slytherin's Locket Rowena Ravenclaw's Diadem Harry Potter Nagini is the 7 different horcrox