A young member of the Sleeves who serves as the devoted commander of Full Frontal’s royal guard. He holds the rank of Lieutenant. Angelo’s Geara Zulu is a customized machine with a violet color scheme.
(Source: Official site)
The novel reveals more on his motivations for his near worship of Frontal: his father was killed, while he and his mother were sexually abused by Federation soldiers in the aftermath of the Federation's invasion of the town of Globe. The abuses continued with the master of the house that took him and his mother in. Later on, after his mother committed suicide, and Angelo committed himself to prostitution to survive, he later encounters Full Frontal who later takes him in - paralleling how Char took in Lalah Sune years prior.
(Source: Gundam wiki)