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The term "character development" often relates to how the character changes through the chronological sequences of the narrative: how the character develops in relation to events and experiences. You seem to be asking more about "characterization": characterization is how characters are introduced and presented.
In brief, the two main characters Phineas (Finny) and the narrator, Gene, are given full (rounded) characters having a broad range of thoughts, emotions and psychological motivations and reactions. The secondary characters are presented with less detail and, in some sequences, like the opening of the book, are mere shadows that are there with them but given flesh and reality, though is not true for all sequences.
"Is this the one they jump from?"
None of us knew.
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