Kendall Roy's character exhibits signs of narcissistic personality traits, which can manifest as an inflated sense of self-importance and a deep need for admiration.

This can be seen through his relentless pursuit of validation from his father, Logan Roy.

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Throughout "Succession," Kendall struggles with substance abuse issues, often using drugs and alcohol to cope with the pressures of his family dynamics and corporate responsibilities.

This reflects a common pattern in individuals dealing with mental health problems, where substances may be used as a form of self-medication.

Anxiety disorders are prevalent amongst individuals in high-stress positions, and Kendall's behavior often aligns with those who face performance anxiety, especially as he grapples with the fear of failing to meet his father's expectations.

The show illustrates the concept of "toxic masculinity," particularly through Logan Roy's relationship with Kendall, which can create deep psychological scars.

This familial pressure can lead to feelings of inadequacy that Kendall frequently exhibits throughout the series.

Depression is often linked to feelings of hopelessness and a lack of fulfillment, conditions Kendall experiences as he navigates the turbulent waters of his family’s expectations and his own ambitions.

The portrayal of Kendall can be analyzed through a psychological lens called the "father complex," where a man's relationship with his father heavily influences his self-esteem and behavioral patterns, resulting in struggles with authority and self-identity.

In psychological terms, the "cycle of abuse" may apply to the Roy family dynamics, where Kendall's father's neglect and criticism could perpetuate Kendall's own feelings of worthlessness and his self-destructive behaviors.

The character's fluctuating self-esteem can be associated with borderline personality disorder traits, which is characterized by intense emotions, self-image issues, and unstable relationships, as seen in Kendall's tumultuous interactions with his family and colleagues.

Kendall's need for control can be linked to obsessive-compulsive traits, where he frequently tries to manage his surroundings and relationships in a bid to counteract his feelings of inadequacy in a chaotic family environment.

The intersection of privilege and mental illness is a significant theme in "Succession." Despite his wealth and status, Kendall experiences profound emotional pain, highlighting that mental illness is not exclusive to socioeconomic status.

The attachment theory can shed light on Kendall's behavior, particularly regarding his anxious attachment style due to his volatile relationship with his father, which manifests in his constant need for reassurance and validation.

The series' dramatization of Kendall's mental struggles opens a conversation about the stigmatization of mental health in high-pressure careers, particularly in executive roles where vulnerability is often masked by a facade of success.

Research indicates that children of narcissistic parents, like Kendall, often face identity issues as adults, leading to feelings of inadequacy or overcompensation, which is a central theme in Kendall's character development.

Notably, psychological studies support the idea that familial dysfunction can lead to the development of personality disorders, suggesting that Kendall's narcissistic traits may be compounded by his upbringing within the Roy family's power struggles.

Individual therapy approaches, like Cognitive Behavioral Therapy (CBT), could potentially help a character like Kendall confront and reshape his thought patterns surrounding his family and his own self-worth, offering avenues for healing and growth.

The success of "Succession" in portraying mental health themes underscores the growing awareness and conversation around mental illness, particularly in wealthy, influential circles where help is often sought less frequently.

Research has shown a link between high-stress environments and the deterioration of mental health, indicating that Kendall’s corporate battles exacerbate his mental illness, showcasing how external pressures can affect internal well-being.

Kendall’s repeated attempts to achieve his father's approval could represent a common psychological phenomenon known as "confirmation bias," where he only perceives situations that reinforce his belief that he is not good enough.

The chaotic dynamics of the Roy family can also be explained through family systems theory, where members adapt to roles that perpetuate dysfunction, often leading to a lack of healthy communication and the perpetuation of mental health issues.

Finally, the portrayal of Kendall’s mental health in "Succession" serves as a reflection of broader societal issues regarding mental wellness and the often unseen struggles faced by individuals, regardless of their external personas or wealth.