Yes, it seems that classes do share some similar traits. 

That remains to be seen but there are a lot of theories that players who share the same aspect can ascend on the other person’s Quest Bed.

Yes, see Jasprosesprite^2

He is always supposed to help take down the Black Queen whether on his own or while working with the players.

When two cherubs still share a body saying the name of the one that is asleep forces the personalities to switch.  Like if you said Caliborn to Calliope back when they had the same body Calliope would go to sleep and Caliborn would wake up.  Calliope told Roxy her name because she feared Caliborn was up to something and would try to predominate (which he did)

Yes they work differently. 

When you die on a Questbed the body that didn’t die there becomes the main one, thus why Jadesprite became the main Jade.

When you die on a Sacrificial Slab the body that died there becomes the main one and any extra bodies died, thus why Aradiasprite/Aradiabot exploded.

His earlier works are definitely all of those things.  He has grown as a person over the years and realized his mistakes.  In the past Hussie has said that Dave is the most similar to himself and he identifies the most with him.  Dave’s recent speech about growing and realizing how offensive he was in the past and how it was wrong was Hussie’s way of telling his fans that he’s grown and acknowledging his past errors.

For future reference I’ve added this to the faq, but here you go.

Because it takes time to make things

A couple years ago I did extensive research on class and aspect as well as performed a character analysis on myself and decided upon a classpect that both fit and challenged myself.