Spark

Spark was the son of murdered Trinsic blacksmith Christopher in Ultima VII, and was a potential party member in the game. He is undoubtedly one of the youngest companions the Avatar possessed, claiming to be fourteen years of age when the Avatar first met him. At the time of Ultima VII, Spark was an orphan, his mother (name not known) having died shortly after his birth.

Ultima VII: The Black Gate
Spark was first be encountered in gameplay by his father's house in the northwest corner of Trinsic. His character portrait initially showed a crying sullen teenager, as he was obviously stricken with grief when he first encountered the Avatar.

Spark explained that he was among the first to find his father's ritually dismembered corpse, and was helpful to the Avatar as he/she pursues an investigation of the murder. Spark pointed out Christopher's recent decision to leave the Fellowship, his sudden acquisition of wealth, and the presence of a hook-handed man and a  wingless gargoyle fleeing the scene of the murder.

He then begged the Avatar to allow him to accompany him/her, out of a desire for revenge against his father's killers. Iolo, if present in the party, professed some doubt as to the wisdom of adventuring with a child, and was rebutted by Spark knocking an insect near to Iolo's head out of the air with a sling stone. Ultimately, having Spark accompany the Avatar was optional.

What happened to Spark after the events of Ultima VII was unclear, as little mention is made of him in later games.

Ultima IX: Ascension (Fan Made Dialogue Patch)
In the dialogue patch for Ultima IX, Spark appeared as a dead Paladin in Trinsic.

Trivia

 * Spark provides a number if humorous remarks throughout gameplay if he is present in the party, often making awkward inquires regarding wenches.