Radigan Conagher, is one of the supporting characters of Team Fortress 2 and well known as Engineer's grandfather. He is a well known wise old man who constructs and fixes machines.
In Loose Canon
In 1850, he visits a woman named Elizabeth, who considers him to not build he machine to Blutarch Mann to outlive his "twin" brother Redmond Mann. She offers him australium for an alternative. She also asks him to build a machine for Redmond Mann. And later in Loose Canon page reval he gaing more muscle and acting Australian-Texans hybird due of Australium Poisoning or Turned into Texan version of Saxton Hale.
Fan Art and Fan Fictions
After his time in the events of the Team Fortress 2 comics, he has been a popular character with fan portraits and well known internet stories.