Blunder

Blunder (ブルンダー ,Burundā) is a member of the Brothers Bear family in Donkey Kong Country 3: Dixie Kong's Double Trouble!. Blunder's Booth (library in the Gameboy Advance remake) is found on the overworld map to the left of Kremwood Forest. Blunder is the least involved in the overall item collecting and trading that the other Brothers Bears do, as he has literally nothing to trade.

Summary
Going to Blunder is entirely optional; the entire game can be fully completed without stepping foot in Blunder's Booth. Blunder usually acts like he's overly smart compared to the Kongs, and he may accidentally reveal clues about reaching the secret lost world, Krematoa. He slowly reveals clues until the Kongs beat KAOS Kore when he comments how they would "...ever think of circling the rocks...". He goes so far as to state Dixie and Kiddy unlocked Krematoa with some strategy guide, but later confesses he did so himself.

Etymology
Blunder's name could be a reference to a "Chess Blunder", where a player makes a mistake in the game out of overconfidence or carelessness. As such, Blunder often reveals secrets out of mistakes and constantly thinks highly of himself.