Aragorn II Elessar
Aragorn II, son of Arathorn II and Gilraen, also known as Elessar and Strider, was the 16th Chieftain of the Dúnedain of the North; later crowned King Elessar Telcontar (March 1, 2931 - FO 120 or SR 1541), the 26th King of Arnor and 35th King of Gondor - and first High King of Gondor and Arnor since the short reign of Isildur. He was a great ranger and warrior, and as Isildur's heir he bore the shards of Narsil, reforged and renamed Andúril, Flame of the West, in the War of the Ring.
Gandalf the Grey
Gandalf (Norse; IPA: [gand:alf] - "Elf of the Wand" or "Wand-elf") the Grey, later known as Gandalf the White, and originally named Olórin (Quenya; IPA: [oˈloːrin] - "Dreamer" or "Of Dreams"), was an Istar (Wizard), sent to Middle-earth in the Third Age to combat the threat of Sauron. He joined Thorin and his company to reclaim the Lonely Mountain from Smaug, convoked the Fellowship of the Ring to destroy the One Ring, and led the Free Peoples in the final campaign of the War of the Ring.
Frodo Baggins, son of Drogo Baggins, was a Hobbit of the Shire during the Third Age. He was, and still is, Tolkien's most renowned character for his leading role in the Quest of the Ring, in which he bore the One Ring to Mount Doom, where it was destroyed. He was a Ring-bearer, best friend to his gardener, Samwise Gamgee, and one of the three Hobbits who sailed from Middle-earth to the Uttermost West at the end of the Third Age.
Legolas was a Sindarin Elf who was part of the Fellowship of the Ring in the Third Age. Son of the Elvenking Thranduil of Mirkwood, Legolas was Mirkwood's prince, a messenger, and a master archer. With his keen eyesight, sensitive hearing, and excellent bowmanship, Legolas was valuable to the Fellowship in their journey across Middle-earth. He was well-known for becoming friends with the dwarf Gimli, despite their long-held differences.
Witch-king of Angmar
The Lord of the Nazgûl, sometimes known as the Witch-king of Angmar, was the leader of the Nazgûl (Ringwraiths) and Sauron's second-in-command during the Second and Third Ages. His true identity is unknown; once a king of Men, possibly of Númenórean heritage, he was corrupted by one of the nine Rings of Power that had been given to the lords of men, becoming a wraith in the service of Sauron.
Gollum, originally known as Sméagol (or Trahald), was at first a Stoor, one of the three early Hobbit-types. The name Gollum was derived from the sound of his disgusting gurgling, choking cough. He was born c. TA 2430. His death date is given as March 25, 3019. His life was extended far beyond its natural limits by the effects of possessing the One Ring. At the time of his death, Sméagol was about 589 years old, a remarkable age for a creature that was once a hobbit, but he had been deformed and twisted in both body and mind by the corruption of the Ring. His chief desire was to possess the Ring that had enslaved him, and he pursued it for many years after Bilbo Baggins found it when he encountered Gollum in the Misty Mountains during the events of The Hobbit.