Yashamaru succeeded where the assassins failed. He didn't kill Gaara’s body; he killed his soul.

Yashamaru's presence in the series has a significant impact on the story, as his actions and decisions influence the lives of those around him. His relationships and experiences serve as a catalyst for the events that unfold, often leading to dramatic and intense confrontations.

Yashamaru is often portrayed as a free-spirited and confident individual, always ready with a witty remark or a clever quip. He is fiercely loyal to those he cares about and will go to great lengths to protect them. Despite his seemingly lighthearted nature, Yashamaru struggles with intense emotional turmoil, stemming from his complicated relationships and tragic experiences.

According to cognitive analysis highlighted by platforms like Instagram's Anime Psychology Community, this betrayal fundamentally altered Gaara’s mental schema. Rather than viewing the event as an isolated betrayal, Gaara's mind concluded that closeness itself was unsafe, leading to his iconic transformation into a cold-blooded killer who lived only to love himself.

Years later, during the Fourth Shinobi World War, the resurrected Fourth Kazekage confessed the truth to Gaara: Yashamaru did love him deeply, and the harsh words spoken were a forced mandate by the village leadership. 2. Yashamaru Kurama in Samurai Shodown

Here is a character piece regarding Yashamaru.