A fictional character becomes easier to discuss when you examine what they do in a particular situation. General labels such as brave or selfish can hide the tensions that make a story interesting. Begin with a decision the character faces.
Note what they know at that moment and what they appear to want. Separate information available to the reader from information available to the character. This distinction can change how a choice looks.
Look for a later action that supports or challenges your first impression. A repeated pattern may matter, but so may an exception. Use specific scenes to explain your interpretation rather than searching only for evidence that confirms it.
When discussing the character, leave room for another reader to notice something different. An interpretation becomes stronger when it explains details consistently and acknowledges uncertainty. It does not need to reduce a complicated person to a single moral verdict.