The Firesiblings' Main Flaws
Firestar: Major guilt complex and minor hero syndrome. He strives to keep the peace and feels like when things go wrong it's his own fault, even when a situation has nothing to do him. He feels like he must solve everything, even when it doesn't have to do with him, often inserting himself into issues that aren't his. Additionally, he feels like he has to make up not just for his own mistakes, but for those around him as well. Often gets stuck trying to figure out a way to appease all the sides of a situation.
Creekflower: Escapism and hypocrisy. While she has built herself up as the "bossy" know-it-all do-gooder rule follower since her kithood (just ask Lightningfur), the reality is that she keeps that persona up to hide her guilt at not being perfect. Where Firestar feels imperfect and tries to please others to make up for it, Creekflower instead hides away in shame, seeking out things to distract herself, and then hides that shame behind a mask of confidence.
Copperleaf: Abrupt impulsiveness. A strong sense of "justice" (often correct) that leads to rash and unthought-out decisions without thinking through all of the consequences. Stubborn about doing what's right and will throw himself into situations headfirst without regard for his own safety. A lack of doubt surrounding his actions bred a sense of invincibility that inevitably led to his end.
Airleap: Incapable of viewing himself as anything other than weak and worthless. Always felt like a nuisance and attempted to "make up for it" by acting how those he admired did. Often, those ways were not good, and he only felt worse about himself for not being able to live up to those expectations. Believed he desired to be stronger, realized he just desired to be liked.
Lightningfur: An obsession with power and an inability to accept not being in control. Must be entirely in control of any situation at any given time and absolutely despises when things don't go her way. Becomes extremely stressed and agitated when not in control as, ironically, she cannot control her emotions/reactions.
Darkstripe: Strong follower mentality. Needs others' praise and validation to feel good about himself. Lacks the ability to form his own morals and let's others dictate the "morality" of a situation for him (and/or will "ignore" any previous morals established if it doesn't fit with the image he has of someone in his head). Very easily susceptible to what others' say about him, causing mood swings of guilt and anger when those things aren't good things.
Whitestorm: Nothing he is perfect. (JK it's compliancy.)