Mulch Diggums is a fictional kleptomaniac dwarf from the Artemis Fowl series by Irish fiction author Eoin Colfer. He has been arrested numerous times by the LEP due to his criminal nature; stealing from Mud Men is his speciality. An expert burglar, he is also infamous for his powerful and deadly flatulence, varieties including, the "torpedo", and the "cyclone". As a dwarf, he can tunnel underground using his unhinged jaws at high speeds. He even has his own tools to work in his kleptomaniac favour. His beard hair act as antennae and he can pick up vibrations through walls and underground. Also, when they are pulled, they stiffen and form to work as keys and other useful items. When his spit dries it becomes rock solid and glows in the dark. It also contains a sedative. His dwarf rock polish is used to melt glass and metal. A side effect of his flatulence is the buildup of Methanobrevibacter smithii archaea, which prevents aeroembolism. A running joke in the series is that he smells horrible.
Aliases
Mulch Diggums has used various aliases in the Artemis Fowl series, including Lance Digger, Mo Digence, The Grouch, Tombstone and likely various others in his three hundred year "career" as a thief.
Role in the series
''Artemis Fowl''
In the first book, Artemis Fowl, he is blackmailed by the Lower Elements Police to assist in the siege of Fowl Manor. He is able to infiltrate the manor by burrowing under the wine cellar and gives Domovoi Butler, Artemis' accomplice, quite a surprise. He finds out that Artemis's secret weapon is a copy of the Book of the People. He fakes his death in a cave-in as a bid for freedom, and steals bars of gold from the Lower Elements Police Holly Short ransom fund before tunnelling away.
''The Seventh Dwarf''
Mulch was lured by Artemis Fowl to steal the priceless Fei Feitiara which contains an enormous blue diamond. However, a group of six dwarves led by Sergei the Significant have already stolen the tiara and plan to sell it at a circus to several European jewellery fences. As the dwarves perform in the circus, Mulch sneaks in underground and takes the tiara, also knocking out their leader, Sergei.
''The Arctic Incident''
In Artemis Fowl and the Arctic Incident, he has used the gold he stole in the first book to buy himself a fancy apartment in Los Angeles, under the alias Lance Digger. He quickly returns to his old ways, and becomes a thief known as "The Grouch", famous for stealing one of every Academy Award trophy. After being found by Artemis and Holly Short, he helps them break into Opal Koboi's laboratories, in exchange for a two-day head start, which he takes as soon as the mission is over.
''The Eternity Code''
In Artemis Fowl and the Eternity Code, he is initially working for the Antonelli family as a "monkey" under the alias Mo Digence, but foils a plot to kidnap Artemis, and subsequently assists him in breaking into the Spiro Needle to steal back the C Cube. After this, Artemis Fowl helps him by changing the date on his original search warrant, rendering all further convictions void. Artemis gives him a gold medallion which is actually a computer disc with information to help Artemis recover his memories after the mind wipe.
''The Opal Deception''
In the fourth book, Artemis Fowl and the Opal Deception, he is en route to his hearings when he hears of Commander Root's death and escapes from and steals a LEPrecon shuttle, knowing that Holly couldn't have committed the murder and regarding Root as a 'sort of' friend. He delivers the disc Artemis gave him to Butler, Artemis' bodyguard, restoring Butler's memory and allowing the two of them to come up with a plan to rescue Artemis and Holly Short from Opal Koboi, in the Eleven Wonders Exhibition in the Lower Elements which was full of trolls. Mulch joins forces with Holly Short, Artemis Fowl, and Domovoi Butler. Mulch sneaks aboard Opal's vehicle and moves the shaped charges to the "booty box." He also steals all of Koboi's precious truffles along with one of her diamond earrings.
''The Lost Colony''
In Artemis Fowl and the Lost Colony, Mulch, now a PI, is needed by Artemis Fowl to foil a plan to expose the missing demon race. He helps them break into the Paradizo chateau, rescue Minerva Paradizo from the clutches of Billy Kong and while Holly is away in Limbo, he runs the PI firm with another ex-criminal partner, Doodah Day.
''The Time Paradox''
While Artemis and Holly are trapped in the past, a "younger" Mulch rescues them from Artemis' younger self. He then agrees to accompany them to save the silky sifaka lemur for a stupendous amount of gold. The three friends are able to successfully capture the lemur by having Mulch tunnel underneath it and steal it away from Dr Kronksi, but Holly is kidnapped by the younger Artemis. Mulch stays with the lemur until Artemis rescues her, and they return to Fowl Manor. He is accosted by Opal Koboi who drains his memories from the past three days to find Artemis and Holly, and doesn't remember the experience, or his shoe size.
''The Last Guardian''
Mulch Diggums played a pivotal role in saving Artemis's life several times, ultimately ruining Opal Koboi's plan. He also displayed his ability to ride a troll.
