Often hailing from established institutions, ISTJs often come across as aloof and superior, lacking emotional warmth. Feelings are often difficult for an ISTJ to express, requiring more than usual effort to express. When a Guardian does express emotion, it is rarely verbally, instead making use of more subtle gestures. They are defined by their dedication to what they perceive as their duty, which often imbues them with a keen sense of morality. Though they are not immune to the cognitive dissonance stemming from tough decisions, ISTJs are much more willing to make them and stick with their choice, and any results it might bring. Due to their code of ethics, Guardians despise inconsistency within others, especially those who make commitments and do not deliver what they promised. Usually firm traditionalists, they fight against anything they consider to be threatening.
Perhaps no other Supernatural character is a better fit for the role of Guardian than the, quite literal, Guardian Angel. As typical of an ISTJ, Castiel serves an established tradition, Heaven itself (arguably the oldest tradition), and, certainly in the earlier seasons, displays a keen interest in his angelic duties and a very clear-cut moral code. He is comfortable with difficult choices, siding with Uriel when the latter suggests smiting an entire town filled with innocent people, despite the cost that they might have, though has become more flexible as we have gotten to know him. His loyalty to Heaven has lead him to defend it on multiple occasions, and though he ultimately does not remain loyal, it takes an almighty push to separate him from his tradition. Castiel is reserved, not fully understanding emotions, preferring to show his care for others through actions rather than explicitly stating them, though he does show his anger in extreme situations.
On the surface, Catelyn might seem an odd choice for the Guardian role, considering its emphasis on a lack of emotional warmth and her own position mostly defined by her motherhood. However, ISTJs are by no means unemotional, they simply do not share their emotions quite as much as other roles. In the books, Catelyn’s emotions are mainly portrayed through her thoughts and her actions, rarely does she openly express them, in typical ISTJ style. Catelyn does stem from an established tradition, represented as House Tully, and is devoted to the duties this position has bestowed on her, mainly being a good wife and mother for Ned and their children. She thinks little of those who do not keep their word and seeks to enforce the codes of her own tradition, which is best shown by her hostility to Jon Snow.
A keen sense of morality is an understatement when it comes to describing the character of Samara. As a member of the ancient order of Justicars, Samara’s life is dominated by her devotion to the principles of Justice, which are unfaltering and merciless. As a Guardian, she does not question these principles and will not allow them to mocked in her presence. She makes tough choices and neither doubts nor is burdened by the results, even if they might result in the death of someone close to her. Samara is emotionally cold, refusing to show much of her inner life, keeping every feeling locked away beneath her taciturn mask, often coming across as believing herself to be superior to others. She does not look fondly on the behaviour of others, which for her seems to be filled with contradictions. Samara is the epitome of an ISTJ.
The Blue Fairy
Responsible for all the Fairies within the Enchanted Forest, Blue upholds this tradition and defends its rules from those who breach their code, such as Tinkerbell. She becomes exceptionally disappointed by Tinkerbell’s behaviour when she professes to both respect her tradition whilst also breaking their code of conduct. Though she evidently cares for others, Blue does not share her emotions and never speaks of them, simply acting to fulfil her duty of caring for others.
Sixsmith is a quiet individual, never seemingly showing that much emotion save for the moment at which he discovers his lover’s body, at which point his decorum breaks. Aside from this time, Rufus shares how he feels through only a subtle smile or a certain look in his eye, never through explicit verbal confirmation. He comes from Cambridge, a place of well-established tradition though he does not appear defending this tradition. As an old man, Sixsmith is less than forthcoming with his emotions, though he does display a keen sense of morality, willing to risk, and eventually lose, his life in order to do what he feels is right.
As a Grey Warden, Duncan also stems from a long tradition, in typical Guardian style. His duty, to fight the Darkspawn and defend Fereldan, is something he takes with the utmost seriousness, willing to devote his entire life and sacrifice himself in order to see that the job is done, as far as it can be. Duncan defends the Grey Wardens when they are threatened, unwilling to allow his order to be reduced to something purely ceremonial. He is able to live with difficult decisions, such as forcing people to undergo the joining, thus endangering their lives. Also, Duncan is not impressed by those who do not meet his expectations.