Diodora Astaroth is a character you come across in the anime series High School DxD, which itself is adapted from the popular light novel penned by Ichiei Ishibumi. Now, Diodora Astaroth isn’t one of the central figures, but he definitely leaves an impression—especially during the second season, where he shows up as a minor antagonist. He hails from one of the prestigious 72 Pillars of devil families, the Astaroth lineage, and that background plays a big role in how he carries himself throughout the story.

When we first meet Diodora Astaroth, it’s clear he’s got that classic villainous charm—tall, good-looking, with striking blonde hair and piercing blue eyes. He’s usually dressed to impress, often seen in a tailored suit that screams wealth and status. There’s a certain arrogance about him, an air of superiority that makes it obvious he thinks he’s above most people. And honestly, that fits right into his personality: cunning, manipulative, and totally self-serving. Diodora Astaroth doesn’t really care about anyone else’s needs or feelings—he’s all about what he wants.

And what does Diodora Astaroth want? Well, that would be Rias Gremory. From the moment he steps onto the scene, his obsession with her is unmistakable. It’s not love in any healthy sense—it’s more like possession, control, and ego. He goes to extreme lengths to try and win her over, including manipulating Asia Argento, a kind-hearted girl who ends up being used as a pawn in his schemes. That alone tells you everything you need to know about Diodora Astaroth—he’ll exploit anyone if it gets him closer to his goal.

Things really escalate when Diodora Astaroth attempts to force Rias into marriage through a dark sacrificial ritual. Yeah, it’s as twisted as it sounds. But, thankfully, his plans are foiled—largely thanks to Issei Hyodo, the main protagonist, and Rias’ loyal friends. So while Diodora Astaroth puts up a strong front, his arrogance ultimately leads to his downfall. He’s a classic example of someone who underestimates the power of genuine bonds and loyalty.

Looking at Diodora Astaroth from a psychological standpoint, he fits the ENTJ personality type pretty well—Extraverted, Intuitive, Thinking, Judging. This means he’s a natural-born leader, confident, strategic, and always thinking several moves ahead. Diodora Astaroth thrives on ambition and control, and he’s not afraid to make tough calls—even cruel ones—if they serve his vision. He relies heavily on logic and analysis, rarely letting emotions cloud his judgment. That cold rationality is both his strength and his flaw.

But here’s the catch: Diodora Astaroth’s leadership style is deeply flawed because it lacks empathy. He sees people as tools, not individuals. He’ll manipulate, deceive, and discard allies without a second thought. While that might work in the short term, it inevitably leads to conflict—especially with characters who value integrity and compassion over power and prestige.

Then there’s the Enneagram angle. Diodora Astaroth lines up closely with Type 3—the “Performer.” These types are driven by success, recognition, and image. They want to be admired, respected, and seen as the best. And that’s exactly what Diodora Astaroth is chasing. Whether it’s his desire to become a devil king or his desperate need for Rias Gremory’s approval, it all ties back to validation and status. He’s obsessed with appearances, crafting a perfect public persona while hiding his true, morally bankrupt self underneath.

The tragedy—or maybe irony—of Diodora Astaroth is that his relentless pursuit of success blinds him to what truly matters. His lack of authenticity, his willingness to betray others, and his complete disregard for their well-being are what ultimately bring him down. In a story that values friendship, loyalty, and emotional growth, Diodora Astaroth stands as a stark contrast—a reminder of what happens when ambition isn’t balanced with humanity.

So, in the end, Diodora Astaroth serves as more than just a villain-of-the-week. He’s a cautionary figure whose traits—whether viewed through MBTI or Enneagram lenses—highlight the dangers of unchecked ambition and emotional detachment. While he may not be a major player in the long run, Diodora Astaroth certainly makes his mark, even if it’s one of failure and defeat.