Can you do a main character analysis, explaining traits for each main character, Bryon and Mark, in That Was Then, This is Now?Character traits...

BRYON DOUGLAS.  The narrator
of the novel, Bryon tells the story of the collapse of his close friendship with his
foster-brother, Mark. Although both boys spend a great deal of time away from home and
roaming the streets, looking for trouble (due in part to their dysfunctional, single
parent home life), Bryon eventually tires of this scene. His love and loyalty for Mark
are strong: He tends to Mark's injuries after a fight and willingly accepts a beating
that is meant for Mark. But Bryon begins to change after talking with Mike Chambers in
the hospital; Chambers tells him how he is beaten but chooses not to seek revenge. The
guilt over how Bryon lives his life increases after his friend Charlie is killed while
helping Bryon and Mark. He matures further after he falls in love with Cathy, sees his
mother hospitalized, and decides to get a job. But the toughest decision of his life
comes when he turns Mark in for drug dealing after his friend, M&M, overdoses on
LSD. Bryon questions his own motives for having Mark arrested, but he testifies against
him and then visits him in prison. Bryon sees that Mark has changed for the worst, and
Mark tells him that their friendship--"that was then, this is now"--is over. In the end,
Bryon--having lost both Cathy and Mark--wishes he were young again, when life and its
problems seemed so much
simpler.

MARK.  A boy with a
terrible past, Mark is taken in by Bryon's mother after Mark's parents kill themselves
during a drunken brawl. Mark loves Bryon like a brother, and he enjoys the gang life
they lead during their early teens. But while Bryon seems determined to make a change in
his life, Mark prefers the status quo. Mark seems to have little regard for what is
right and wrong, and when Bryon begins spending time with Cathy instead of him, Mark
becomes jealous. Mark turns to selling drugs, for which he shows no remorse. He grows to
hate Bryon after his arrest, and his behavior while in the juvenile detention center is
so bad that it appears he will eventually be sent to an adult prison. As Bryon seeks to
improve his life and make amends to Mark, Mark never wants to see his friend again, and
he seems intent upon destroying himself behind bars.