Concepting - What motivates your character?
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I find many (too many) people lack one very important aspect of a character. "Something" that their characters would risk their lives for. The "sink or swim". The end goal that is worth the character's life.
When you concept, always ask yourself "what would my character risk his life for?". Ask yourself that, and you'll find out you'll be much more willing to see your character's story end, because the risks he took were worth.