Klutzy, the most unlikely of heroes, saved Herbert P. Bear from drowning after his iceberg tipped and became Herbert's sidekick. Therefore, that would be the reason why he is Herbert's sidekick. He is a red crab with no clothes. He might want to join the EPF and stop helping Herbert with his evil schemes.
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.
He might want to join the EPF, and never help Herbert. There is proof for this because in the System Defender level 'Track Herbert' he is dissapointed when Herbert orders him to send in another wave of bots.
In the latest Field-Ops missions, Gary indicates that the tracker has picked up "snapping" and "clicking" noises (which are the sounds Klutzy makes).
Klutzy returns in Level 3 of System Defender. He also appears in Level 2 of the game, assisting Herbert.
Klutzy is sometimes called 'adorable' and 'cute'. Also referenced in Mission #7 as a "funny little guy" by a penguin.
There is also a Series 4 figurine of Herbert and Klutzy.
Klutzy is seen using the signs ^_^; Q_Q' while writing.
In one mission, he is seen playing a game while Herbert talks to the agents.
Klutzy is 2 feet tall. Klutzy is also a vegetarian.
It is rumored that the Crab skittering around during the Adventure Party is really Klutzy, undercover.
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.
His name may come from the fact that he often knocks things over, messes up things, is clumsy, etc.
Klutzy was shown not to be as evil as Herbert, and still likes puffles, as shown in Puffle Trouble.
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 can be meetable in the future in Club Penguin, though unlikely because it didn't read "If you want to add him/her, you must meet him on the island." like most mascots read.
Klutzy might not like puffles, since he ripped up a puffle bed in the EPF Missions.
Klutzy stealing the target in Mission 7.
Klutzy playing with a beach ball during Mission 9.
Klutzy falling down the Test Run in the mission "Questions for a Crab"
Klutzy trying to escape the HQ in Questions for a Crab.