Who is the colossal titan in "Attack On Titan"?

The Colossal Titan in Attack on Titan is Bertolt Hoover. He is one of the main antagonists in the series and is part of an enemy organization known as the Warriors. Bertolt possesses the ability to transform into the Colossal Titan, a massive and immensely powerful Titan that can emit scorching steam. Throughout the show, it is revealed that Bertolt infiltrated the Paradis Island as a spy, and his role as the Colossal Titan plays a crucial part in the plot, particularly during the Battle of Trost and the Shiganshina District.