The master and cassette ever
Stringcase and Solarcharge are definitely my babies (even though I need to discuss them more), they're my duo with the fullest established story
[Size for comparison: in g1 Stringcase is the same height as Optimus Prime (big man) and Solarcharge is the size of the average human child]
Stringcase was a caretaker who lived life as a bard before he died (he comes back dw) leaving Solarcharge to survive on his own, making him quiet and angry. Solarcharge came to hate both Autobots and Decepticons, chosing instead to be a neutral mercenary
When Stringcase gets revived, Solarcharge retires to stay with him, traveling with his master through thick and thin
((Don't tell my friends I'm posting these))