In the novel once Morris Gleitzman portrays Felix as a caring character because he cares for Zelda his new friend and the orphans by telling them stories from his imagination. On page 66 Morris Gleitzman writes about how Felix was caring towards Zelda “Once I spent about six hours telling stories to Zelda, to keep her spirits up-” clearly Morris is telling us that Felix obviously cares about her and doesn’t want Zelda to feel down in the dumps. Keep in mind that Zelda does not know her parents are no longer alive but Felix does, so trying to save Zelda from the heartache is also another example of how caring Felix is.
Also in Once Felix is characterized as positive as he tells people stories to keep them positive