Crown Prince Anduin Llane Wrynn, he is the heir to the throne of Stormwind. He was given the crown at the age of 10, to maintain order, when his father, King Varian Wrynn, disappeared en route to a diplomatic conference at Theramore Isle.
It says in World of Warcraft manual:
"King Anduin is as wise a ruler as any ten-year-old has a right to be. Recently his father, King Varian Wrynn, went missing under suspicious circumstances while en route to a diplomatic summit at Theramore Isle. At the behest of the royal councilor, Lady Prestor, young Anduin was given the crown so that order could be preserved within the kingdom of Stormwind. Though few citizens are aware that their true king has been missing for so long, Anduin does the best he can to allay their fears. It is widely held that the boy will grow to become a shrewd leader one day."
He is the leader of Draenei people, he's been their leader since their flight from Argus. He's been granted the gift of Sight, and has guided his people as they fled from the Burning Legion. He is one of the first among the Draenei and is the arch-nemesis (formely best friend) of Kil'jaeden.
Trivia (just because Babylon 5 is so awesome!):
The name Velen may be related to a character from the sci-fi television series, Babylon 5: Valen. Several general details between the two characters seem similar. Valen appeared aboard a starship seemingly out of nowhere to aid the Minbari in their war against the chaotic Shadows, much as Velen and the draenei crashed on Azeroth just in time to help fight the Burning Legion. Both seem to posses some method of prophecy, and both have contact with a higher race of beings of light, Velen the Naaru, Valen the Vorlons.
Tyrande Whisperwind (pronounced Ti-Ran-Da)
She is the leader of the Night Elves and chosen High Priestess of the Goddess Elune, she is also former general of the Night Elf Sentinels and the current head of Sisterhood of Elune. Together with her mate, the Archdruid Malfurion Stormrage, she has represented the highest leadership of the night elves since the fall of Queen Azshara.
Tyrande bolstered her forces by freeing a number of prisoners when she went to free Illidan, including a wolf named Loki.
She was also the last classic racial leader to receive either new armor or a unique model.