Terra might've given it to Ven because Ven didn't have a Keyblade at the time, and Terra didn't need it anymore.
Terra is Ventus' and Aqua's best friend. He was also a student under Master Eraqus. He also got taken over by the Darkness and believed that Xehanort is a good person. He also gave Riku a blessing that he would wield a Keybalde someday. Terra is also a Keyblade wielder that focuses on power.
-SPOILERS-Terra encountered Riku at Destiny Islands, while on his search for the masked boy (Vanitas). Terra noticed the sincerity and goodness in Riku's heart and gave him the power of the Keyblade.
While on their separate quests, Terra and Aqua both visited numerous worlds, with one of those worlds being Destiny Islands. Terra met Riku and Sora there, and gave Riku the power of the Keyblade, telling him to keep it a secret. Aqua visited Destiny Islands later, and recognized Riku as a predecessor of the Keyblade, realizing that somebody had given him the power of the Keyblade. Aqua then pointed out the resemblance between Riku and Terra, and stated that Riku looks very sincere.
-SPOILERS-While on their separate quests, Terra and Aqua both visited numerous worlds, with one of those worlds being Destiny Islands. Terra met Riku and Sora there, and gave Riku the power of the Keyblade, telling him to keep it a secret. Aqua visited Destiny Islands later, and recognized Riku as a predecessor of the Keyblade, realizing that somebody had given him the power of the Keyblade. Aqua then pointed out the resemblance between Riku and Terra, and stated that Riku looks very sincere.
Because his heart is strong and pure!^_^The keyblade originally chose Riku and Sora was supposed deliver it to him, but Riku's weak heart gave into darkness, so the keyblade chose Sora as its master.
Remember, Birth by Sleep is a pre-sequel to Kingdom Hearts I. The secret movie at the end of Kingdom Hearts II is part of the opening and ending cut scenes of Birth by Sleep. Terra gave Riku the ability to wield a Keyblade, but as Riku grew older, he chose darkness over light and the Keyblade chose Sora instead as Riku's body was possessed by Ansem.
The keyblade chooses the keyblade master, the Kingdom Key chose Sora, Way to the Dawn chose Riku, but only Kairi's keyblade didn't, Riku gave her the keyblade
well technically, Sora's Keyblade is Rikus, as Terra chose Riku, not Sora. Sora was given it as Riku gave into the Darkness. The reason his sword became a Keyblade is as he was no longer evil and could now wield a keyblade
No because kingdom hearts 3 is related to kingdom hearts birth by sleep but Ventus lost his heart in Ventus's secret ending when Ventus gave Sora his heart, Aqua put Ventus into this dome like where Roxas found Sora in it in kingdom hearts 2. Aqua bilt that to make Ventus heal in Aqua's secret ending.
When she met aqua in radiant garden she ran toward her and hid behind her she touched the keyblade and aqua said "i can feel the light" i think she felt the light in her and gave her power to weild the keyblade
He can't. That is Riku's keyblade. actually, he can because as long as you're a keyblade master, you can use anyones keyblade. for example, at the end of KH2 when sora killed Xemnas, or when riku gave kairi her keyblade.
Terra has one older brother. when Terra and her brother where younger they we're captured by a sciencetist who gave them powers that they did not want, Terra escaped and later on her brother did too.