At the end of Chapter 2, he is seen to be sleeping on his throne which is placed in "Blue's Castle"; while The Scientist is wondering where he is.

When you go through Blue the first 2 seconds he sees you, they will not kill you yet. This applies for Yellow and Cyan too, But Orange will kill you immediately once you unbox under them. Blue, Orange, Yellow and Purple are the only Rainbow Friends that have two hideouts since Blue has his Castle in Odd World / Chapter 2 and blue shower in Chapter 1, Purple has it's lair, and vents in Chapter 1 and 2, and Orange has his hideout in Chapter 1 and Chapter 2 that are like Orange's Cavern Coaster in Odd World and Orange's Hideout, for Yellow he has his nest. When moving, make sure that a hiding spot is always available in the event of Blue catching up to you. You should also stay near corners so you can turn a corner and hide in your box if Blue finds you.

Blue is confirmed to be a male. He uses masculine pronouns as shown by the poster in Chapter 1's waiting room that says (Don't let blue hug you, he might be hungry) and Red refers to him similarly. Blue is the second tallest character, with 12 Studs of height (without crown) only losing by 0.1 studs to Green. With crown (possibly part of him) he is the tallest character Blue has 35 audio files associated with him. This includes vocalization, footsteps, and chase ambiance.

In Chapter 2, Blue is capable of spotting you from large distances away. This, however, can buy you enough time to hide without the risk of getting caught. Blue's chase music at the end of the game features music called " Escape the Fate" by Salvador Casais. Slower Speed - Blue is slower than the player. He does speed up significantly in Chapter 2, however, he is still able to be outran.There appears to be scrapped animatronic versions of Green, Blue and Orange in one of the rooms during Cyan's chase sequence at the end of Chapter 2. Blue was thought to be drooling, however, the game files confirm they has some sort of "slime" on their mouth. During the finale, he can be seen sitting in the middle of the stage asleep. The player is advised to not run into any balloons, as touching one causes it to pop, waking up Blue who will chase after the player who caused the disruption. After awhile of running from Blue, he will eventually give up and return to sleep on the stage.