Klutzy (nicknamed "Helpful" in Mission 10 in Herbert's Revenge) is a villainous crab in Club Penguin who saved Herbert P. Bear from drowning when he first arrived to Club Penguin Island after traveling from the North Pole on an iceberg. Since then, he has been involved in a lot of Secret Missions as Herbert's evil sidekick. As revealed in The F.I.S.H., Klutzy is male and is probably Herbert's best friend. You can't meet him in-game, but in missions you can meet him.
Klutzy, before becoming Herbert P. Bear's accomplice, was once a normal crab in the Club Penguin Island. The two became friends when Klutzy rescued Herbert from drowning. Since that day Klutzy has assisted Herbert in his scheme of destroying penguins, though his impact on events is minimal and Klutzy instead often functions as an omen to Herbert's appearance.
In Secret Mission #6, G tries to question Klutzy, but Klutzy escapes back to Herbert. A Secret Agent followed them to their hideout, but was captured. Then, they both attempt to destroy the Ski Lodge for wood, but the Secret Agent escapes and stops them in time. They fell in a lake, but escaped.
In Secret Mission #8, Klutzy (tried to) help Herbert remove the Boiler after they disrupted life on the island by causing tremors due to digging underground. Thankfully, Klutzy turned out to be more of a hindrance than a help, and delayed Herbert until a Secret Agent cornered them. They narrowly escaped when Herbert accidentally damaged the boiler.
In Secret Mission #9, Klutzy and Herbert were plotting about Herbert's next ingenious plan involving Puffles, in their campsite behind the Fishing Hole.
In Secret Mission #11 when Herbert is on the Gift Shop Computer, he is playing a video game. He also makes a couple of 'snaps' when Herbert is speaking on the I.S.E.E.U. system.
In Operation: Hibernation, after you capture Herbert, he escapes the trap which Herbert was in (due to the fact Klutzy can't adapt to the cold) and retreats.
There is a glimpse of Klutzy on the left side of Gary's New Background.
During the Holiday Party 2011 Klutzy came back to visit Herbert and brought a gift for him and disappeared again.
He was seen working with Herbert in the episode Puffle Trouble.
Despite the fact that many people thought he was going to be meetable during Operation: Blackout, he was seen in the Operation: Blackout clip that played after you had completed every stage on November 24. He also made a few appearances in Club Herbert Times.
Even though he isn't meetable during Operation: Puffle, it was revealed that he stole a coin-operated dial, which was used to power a giant hot sauce bottle to warm him and Herbert.
He is seen in We Wish You A Merry Walrus with Herbert.
There was a page in The F.I.S.H handbook in the HQ. It was at the back of the book. It is Herbert P. Bear's and Klutzy's fact file.
Trivia
Klutzy was referenced in Mission #7 as a "funny little guy" by a penguin.
There is also a Series 4 figurine of Herbert and Klutzy.
Klutzy uses many face emotes such as :) and 0_0 while writing.
In one mission, he is seen playing a game while Herbert talks to the agents.
Klutzy probably communicates in morse code the reason why the Crab Translator 3000 blown up during mission 6. However, it may also be because his sharp claws cut through the cage and damaged the microphone.
It has been showed that Klutzy isn't as evil as Herbert.
On the character page for him, it describes Klutzy as cheerful and kind.
His name may come from the fact that he often knocks things over, messes up things, is clumsy, etc.
He submitted a question to Rookie in the Issue #336 in the Club Penguin Times.
If you search for his name in the friend list, it will read "Klutzy is a click click clickety click. Try searching for someone else." As his name can be searched, it is possible that he will become a mascot in the future
In Herbert's Revenge last mission, He will join you when Herbert decided to help you. You could then call him with the puffle whistle.