Tieria Erde is a Gundam Meister and one of the protagonists of Mobile Suit Gundam 00. Tieria is also an Innovade, acting as Veda's overseer to the Ptolemy Crew of Celestial Being, especially in Season 1. As Celestial Being's Gundam Meister, Tieria is assigned to pilot the GN-005 Gundam Virtue and the GN-004 Gundam Nadleeh during Season 1; he later pilots the GN-008 Seravee Gundam and the GN-009 Seraphim Gundam in Season 2. After the events in Season 2, Tieria becomes part of Veda as its living consciousness and holographic interface within Celestial Being. He operates CB-002 Raphael Gundam in Mobile Suit Gundam 00 The Movie: A wakening of the Trailblazer. At the beginning of the series, Tieria was a negatively-stoic person; distrusting, strict, and self-righteous. Tieria merely tolerated the people around him for the sake of fulfilling his created purpose. He held both his position as a Gundam Meister and his ability to connect to Veda in high regard. Like Ribbons Almark, Tieria prided himself as one of the central pieces to the Aeolia Plan. Because of these traits, which he thought as blessings, he built himself to be the type who goes by-the-book; to the point where he showed little interest and/or concern about the wellbeing of others. If a comrade ever threatened Celestial Being's objectives, he had no qualms about reprimanding them and/or killing them to preserve CB's integrity. He treated Veda as an unquestionable entity and himself as its priest. It is because of this narrow-minded focus and lack of care for others that he became the least popular among the crew members. During the events of AD 2307-08 (Season 1), certain events began changing Tieria. The issue about someone sabotaging Veda (and later Veda being stolen from Celestial Being's grasp) left Tieria shaken and doubting about his life's real purpose. However, with his comrades' help and support, Tieria eventually got up on his feet again. He learned to respect his fellow comrades and their views; especially Setsuna's view about being a Meister, Lockon's selfless acts to help others and Sumeragi wanting to atone for her past. Through them, Tieria learned of his own human aspects and gained a new purpose to keep fighting. By AD 2312 (Season 2), after being cut off from Veda for years, Tieria made great improvements with his human aspects. His ability to care and trust his fellow comrades made him more likeable with the Ptolemy Crew. The greatest change in character was his sense of faith in humanity. Tieria's heart opened to those around him and he developed a great sense of faith for Setsuna. His relationship with his fellow crew members have improved so much that he learned how to joke around them. Even though he made great improvements to himself as a human, he was still an Innovade; part of Tieria's loyalties was divided when Innovators told him the "truth" behind his true purpose and Aeolia's plan. Tieria became greatly conflicted to follow either Aeolia's plan or to support those dear to him. He eventually decided to reject the Innovators and to fight for humanity, going so far as to declare himself to be human, and asserting his purpose to help guide humanity to Innovate and prepare for the upcoming dialogues. After losing his body after the fall of the Innovators, Tieria became a living consciousness in Veda. Tieria continued to watch over the progress of humanity and the wellbeing of his comrades in Celestial Being. During the ELS Conflict in AD 2314, he returned to Celestial Being in a cloned physical body to help them realize the eventual dialogues with other lifeforms which Aeolia had foreseen two centuries ago.