I do think Stargoth has a lot in common with Solangelo beyond their physical appearance.
Both Nico and Buddy are chronologically older despite roughly being the same age as their partners mentally.
Both lost years with Nico losing years at the Lotus Casino versus Buddy who spent a hundred years asleep.
Both lost and regained siblings.
Both have dark backstories for belonging in "children" properties.
Buddy got fused with the villian key.
Nico had a horrific coming out at the hands of Eros in House of Hades. Then their the whole other thing of what Nyx did to him.
Both have partners who care about their health.
Will is an actual doctor but Chase does go out of his way to make sure that Buddy has food.
Will and Chase have stuff in common too.
They both have a connection to music.
They both have a close connection to their mom.
They both seemed to have been aware that they liked men at a young age.
Both were forced to grow up early with Will having to be the head of the Apollo Cabin due to the fact most his siblings well died.
Chase had to grow up as well due to his father's death and his mother's illnesss.
Both possibly have ADHD it's not confirmed for Chase but it's a high possibility.