Question: If Gallu is a demon Lilu is what?

Context paragraphs:
Demon Dice: Demon Dice, originally published as Chaos Progenitus, is a collectible dice game created by Lester Smith (designer of the better-known Dragon Dice) and Tim Brown.  In it, each player controls a demon made of 13 dice representing body parts (or magical items wielded by those parts), which battles the other player's demon.  The original Chaos Progenitus version presented the concept of these dueling fiends seriously; when the game was republished as Demon Dice by Fast Forward Games (which has since gone out of business), the idea was given a humorous spin, styling the players as "Demon Creation Specialists, Junior Grade" in the bureaucracy of Hell.  Neither version of the game was a great commercial success, though they retain a small and loyal fanbase.

Demon algorithm: The demon algorithm is a Monte Carlo method for efficiently sampling members of a microcanonical ensemble with a given energy.  An additional degree of freedom, called 'the demon', is added to the system and is able to store and provide energy.  If a drawn microscopic state has lower energy than the original state, the excess energy is transferred to the demon.  For a sampled state that has higher energy than desired, the demon provides the missing energy if it is available.  The demon can not have negative energy and it does not interact with the particles beyond exchanging energy.  Note that the additional degree of freedom of the demon does not alter a system with many particles significantly on a macroscopic level.

Maha Sona: Maha Sona or Maha Sohona (Sinhala: මහ සෝනා, මහ සොහොනා) is a "yaka" (or "yakseya" or "devaya", meaning demon) in Sinhalese folklore, who is said to haunt afterlife.  The name Maha Sona means " the greatest demon" or "god or demon of the cemetery" in the Sinhala language.  It is the most feared god or demon in Sri Lanka.  Originally a giant who had been defeated and decapitated in a duel by another giant named Gotaimbara (lived in the 1st century BC), Maha Sonaa has had his head replaced with that of a bear or tiger.  He is believed to kill people by crushing their shoulders and also by afflicting illnesses.  Traditional exorcism rituals are performed to repel the demon in such cases.  Sri Lanka Army's Long Range Reconnaissance Patrol units are popularly known as the "Maha Sohon Brigade", named after this demon.

Wangliang: Wangliang (魍魎 or 罔两) is the name of a malevolent spirit in Chinese mythology and folklore.  This word inclusively means "demons; monsters; specters; goblins; ghosts; devils" in Modern Standard Chinese, but "wangliang" originally meant a specific demon.  Interpretations include a wilderness spirit like the "kui" 夔 "one-legged mountain demon", a water spirit like the "long" 龍 "dragon", a fever demon like the "yu" 魊 "poisonous 3-legged turtle that causes malaria", a graveyard ghost also called wangxiang 罔象 or fangliang 方良 "earth demon that eats the livers or brains of corpses", and a man-eating "demon that resembles a 3-year-old brown child with red eyes, long ears, and beautiful hair".

The Hythrun Chronicles: The Hythrun Chronicles is a fantasy set of novels by Jennifer Fallon told in two trilogies, The Demon Child Trilogy and The Wolfblade Trilogy.  The Demon Child Trilogy follows R'shiel Tenragan as she accepts her fate as the demon child and tries to hold the fabric of her world together while defeating the Karien god, Xaphista, and bringing about some well needed changes to the four main countries of Medalon, Hythria, Fardohnya, and Karien with help from multiple influential characters she befriends.  The Wolfblade Trilogy, set about 30 years before, follows the life of Marla Wolfblade from the age of 15 until she is in her 40's.  It also follows stories of various characters intertwined with that of Marla Wolfblade and explains much of the history in The Demon Child History as it follows Damin Wolfblade and Marla's other children growing up and how the state of affairs presented in The Demon Child Trilogy came to be.  There is a fifth country introduced to the trilogy as well, Denika.  It is off the map and indicated as south of Hythria and Fardohnya across the Dregian Ocean, accessed by ship.

Lilu (mythology): A lilu or lilû is a masculine Akkadian word for a spirit, related to Alû, demon.

Leyenda de Azul: The Leyenda de Azul (Spanish for "the Blue Legend") is a lucha libre tournament held seven times by the Mexican professional wrestling promotion Consejo Mundial de Lucha Libre (CMLL) between 2000 and 2008 and again in 2011 and 2012.  The tournament honors Blue Demon, or "Demonio Azul" as he's sometimes referred to.  The tournament is not nearly as prestigious as CMLL's annual "Leyenda de Plata" tournament.  The winner is given a plaque with a Blue Demon mask on it and a championship belt featuring Blue Demon as well.  There was no "Leyenda de Azul" in 2009 and no plans for a 2010 tournament has been announced so far.  All tournaments have taken place in Arena México in Mexico City and all were held on Fridays during CMLL's Super Viernes show.  In 2009 Blue Demon Jr. threatened to take legal action against CMLL on behalf of the National Wrestling Alliance over CMLL's use of three NWA branded championships.  While CMLL did not publicly respond to the threat they dropped the tournament from their schedule for two years.  In July 2011, CMLL, still not on good terms with Blue Demon Jr., announced the return of the tournament.  The tournament would instead be endorsed by Blue Demon's biological son and Blue Demon Jr.'s adopted brother, El Hijo de Blue Demon.

Lilu (ancient China): Lilu () was a legendary tribe or state of ancient China.  According to legends recorded in the third-century text "Records of Emperors and Kings" (帝王世纪) by Huangfu Mi, goddess Nüwa enfeoffed thirteen tribes or states, all having the Feng (风) surname.  Lilu was ranked the fourth among the thirteen.  Lilu is also mentioned in many other ancient texts including "Zhuangzi", and "Dengzi" by Deng Xi.  Professor Li Yujie of Henan University believes that Lilu was likely the first people in China to cultivate chestnuts (The "li" in Lilu means chestnut).  The Li (栗) surname is believed to have originated from the tribe.

Arthur? Arthur!: Arthur?  Arthur!  is a 1969 British comedy film directed by Samuel Gallu and starring Shelley Winters, Donald Pleasence and Terry-Thomas.  The plot follows a dull and unsuccessful inventor who begins to develop a second identity as a man about town with a completely different life.

Alû: In Akkadian and Sumerian mythology, Alû is a vengeful spirit of the Utukku that goes down to the underworld Kur.  The demon has no mouth, lips or ears.  It roams at night and terrifies people while they sleep, and possession by Alû results in unconsciousness and coma; in this manner it resembles creatures such as the mara, and incubus, which are invoked to explain sleep paralysis.  In Akkadian and Sumerian mythology, it is associated with other demons like Gallu and Lilu.

Supporting paragraphs: Alû Lilu (mythology)
Answer: a spirit