Since I don't know the specific story, Alex is probably the main character. He's a boy who has a connection to drumming, which is the central focus of the story.
I'm not sure who exactly Alex Cooper in 'The Real Alex Cooper Story' is without more context. It could be an ordinary person with a unique story, or perhaps someone involved in a particular event or field.
I'm not sure which 'Logan' you specifically refer to. There could be many people named Logan. It could be a common name for an individual in a story, a character in a movie like 'Logan' where he is a mutant with a complex and tragic backstory involving his powers, his family, and his struggle in a world that often fears and hunts mutants. But without more context, it's hard to tell the full story.