In Japan, conversations often take unexpected turns, including inquiries about your blood type. While in the West astrology reigns supreme, in Japan, it’s all about ketsuekigata, or blood type personalities. Although not scientifically proven, the theory suggests that your blood type shapes your personality. This intriguing notion has roots in history and has sparked numerous studies exploring the evolution of blood types.

How It Started

In Japanese culture, the belief that blood type is a window into one’s personality is deeply ingrained. It’s not just a matter of curiosity – it’s seen as essential for determining compatibility with others and understanding how it influences one’s work and relationships, even extending to interactions with tourists.

The roots of this theory stretch back to 1916, when Japanese doctor Hara Kimata published a research paper positing a link between blood group and temperament. By 1925, military personnel were already categorizing soldiers’ blood types, believing it could reveal their strengths and weaknesses. However, it wasn’t until psychologist Furukawa Takeji’s thesis, “The Study of Temperament Through Blood Type”, that the theory was introduced to the public.

Furukawa’s thesis suggested using blood type to assess both academic abilities and personality traits for school entrance exams. Though met with skepticism from some academics in 1933, the discussions sparked by Furukawa’s work faded into obscurity for a time, only to resurface in 1970 with Nomi Masahiko.

Inspired by Furukawa’s ideas, Nomi authored a book exploring the relationships between blood types and personalities. This book became a sensation, catapulting the theory back into the public consciousness. By the 1980s, it had permeated various forms of media, including music, film, and television, becoming a cultural phenomenon embraced by the Japanese people.

Since then, the blood type personality theory has remained prevalent in Japanese society, influencing everything from personal relationships to professional interactions. So, if you’re still curious about what your blood type might reveal about your personality, let’s dive in and explore each blood type’s unique characteristics.

Do you think you match the description for your blood type?

Blood Type O Personalities

Individuals with blood type O personalities are often described as eccentric, yet remarkably optimistic and socially adept. They possess a natural charm that allows them to effortlessly connect with people from all walks of life. When faced with challenges, they exhibit emotional control, avoiding negativity and maintaining a positive outlook. However, their confidence and focus on the bigger picture may sometimes be misinterpreted as arrogance.

The O group is recognized as natural leaders, a trait exemplified by the significant number of Japanese Prime Ministers belonging to this blood type. Their ability to articulate their thoughts and opinions constructively positions them as effective leaders. Despite their leadership qualities, individuals with blood type O may struggle with expressing their emotions, fearing rejection. To foster deeper connections with them, it’s important to go with their flow and offer support during difficult times, allowing them to open up at their own pace.

Blood Type A Personalities

In the Japanese blood type personality chart, individuals with blood type A are often characterized as highly organized, meticulously precise, and deeply attentive to detail. They possess a diplomatic and friendly demeanor, making them approachable and easy to engage with. Seeking harmony in their relationships, they are adept at fostering a sense of unity among others. However, despite their sociable nature, individuals with blood type A may sometimes retreat into solitude due to their sensitive disposition.

When interacting with individuals of blood type A, it’s crucial to create a comfortable environment and exhibit extra sensitivity, as they are known to be fragile-hearted. Prone to anxiety and easily wounded, they may take time to open up to others. Building a friendship with them requires patience and a gradual approach, taking the time to truly understand and appreciate their unique qualities.

Blood Type B Personalities

In Japan, individuals with blood type B are renowned for their easy-going nature, honesty, and vibrant energy. Among all blood type personalities, those in the B group are often considered the most outgoing. They possess a natural curiosity and aren’t afraid to voice their thoughts and opinions, regardless of others’ reactions. While this trait showcases their honesty, it can sometimes lead to perceptions of selfishness or self-centeredness.

Independence and creativity are hallmarks of individuals with blood type B. They approach life with optimism, maintaining a relaxed demeanor even when faced with challenges. Driven by their goals, they prefer to pursue their aspirations without interference from others. Despite their independent streak, they make loyal and genuine friends, valued for their sincerity and lack of pretense.

Blood Type AB Personalities

Among all blood types, AB personalities stand out as the most intriguing and complex. This rare blood type combines the precise qualities of type A with the free-spiritedness of type B, resulting in individuals perceived as either geniuses or eccentrics. Unpredictable and endlessly curious, those with blood type AB often navigate life by following their ever-shifting moods and circumstances.

Eccentricity defines the AB group, characterized by a natural inclination towards curiosity and exploration. They are driven by the pursuit of ideal dreams and are passionate about acquiring knowledge across various fields. While they exhibit calmness and rationality, their personalities remain multifaceted and nuanced. When engaging with individuals of the AB group, it’s essential to remain composed and patient, embracing the intricacies of their character with understanding and empathy.


Post pic: Blood type horoscope cards sorted by gender and month of birth. Picture: Lupe