Yellow blades are commonly carried by Jedi Sentinels and represent a combination of wisdom and combat skills, both of which Suki possesses.
After betraying Azula, Ty Lee would start using an orange blade. Orange lightsabers represent pacifism, kindness, and negotiation.
When she finally breaks away and betrays Azula with Ty Lee, she’d purify her kyber crystal and make her own saber. White lightsabers are one of the rarest colors and represent neutrality and autonomy.
Red sabers represent the hate, passion, pain, and suffering one has within them. That’s precisely why this saber would be perfect for Azula.
Following his storyline from Avatar: The Last Airbender, he’d eventually turn from the Sith and purify the kyber crystal to white. The new color Zuko chose would be green, representing the wisdom he’s gained in his journey.
Toph would use a green lightsaber as a Padawan. However, she’d make her own blue saber from scavenged parts.
Once Sokka became a Jedi Master, he’d use a yellow kyber crystal and serve as a Jedi Sentinel. When we first met Sokka in the show, he didn’t seem wise or overly clever. But as time went on, he really proved himself with strategy and fighting abilities.