THOSE ARE A LOT OF THINGS TO ASK IN ONE so I will do first impressions.
Right away Isa made a mental differentiation between Roxas and Ventus based on personality. Roxas seems a little fiercer, a little more determined, and not as bright and happy as Ven is, so that makes it easier for Isa to think of them distinctly. He feels really perplexed that he doesn't have any memories of Roxas yet, especially since they have the Nobody connection... and even more perplexed that Roxas seems to trust him way more than Isa thinks he should. All in all, Isa is very (unsure) about Roxas but not in a particularly negative way.
no subject
Right away Isa made a mental differentiation between Roxas and Ventus based on personality. Roxas seems a little fiercer, a little more determined, and not as bright and happy as Ven is, so that makes it easier for Isa to think of them distinctly. He feels really perplexed that he doesn't have any memories of Roxas yet, especially since they have the Nobody connection... and even more perplexed that Roxas seems to trust him way more than Isa thinks he should. All in all, Isa is very (unsure) about Roxas but not in a particularly negative way.
First impressions reverse!