Okay, so why is Diablo so obsessed with Rimuru?
Think about this: a super strong demon, the type that can squash countries, totally bowing down to a slime with a goofy smile. Sounds crazy, right? But when you get why Diablo is so loyal to Rimuru in That Time I Got Reincarnated as a Slime, it makes a lot of sense. It's not just some power thing where he blindly follows his master. Diablo's loyalty is way deeper.
The Demon Who Had Everything ... Except a Point.
Let's talk about Diablo before Rimuru.
Back then, he was called Noir. He was one of the first demons ever made, so old and strong that gods looked like kids playing dress-up next to him. He could wipe out armies super easy, change reality if he wanted, and live forever without even trying.
But he was super, incredibly bored.
Imagine being immortal, unstoppable, watching whole civilizations pop up and disappear like waves. What's left to do? What gets you going when you don't even need sleep?
Diablo liked... watching humans. Not in a creepy way. He was just interested in their hustle, their drama, how they tried so hard to find meaning in their little lives. He was fascinated by feelings because he didn't have any. They fought for stuff. They cared. They made meaning out of nothing.
Diablo just... existed. Strong, scary, but totally empty.
Power with no reason is just... nothing.
The Day Someone Actually Saw Him
Then Rimuru showed up and changed everything.
Rimuru didn't treat Diablo like a tool. He didn't see a weapon or a monster to control. He saw him as someone with his own thoughts and feelings.
For us, that's just being nice. But for a demon who's been feared, avoided, or used for ages? That was a big deal.
Then Rimuru named him.
In this world, naming someone is a big thing. It's like giving them power and saying, You're real, you matter, you're part of my world. When Rimuru named Noir Diablo, he didn't just make him stronger. He gave him an identity. He made him matter.
For the first time ever, Diablo was seen.
Not as a force of nature, not as something scary, but as someone.
When Your Boss Actually Gets You
Diablo isn't just loyal because of that first meeting. Rimuru's whole deal lines up with what Diablo thinks is important.
Rimuru is building a place where monsters, humans, everyone can live together. He protects the people who trust him, even when it's hard. He thinks about what he does and takes responsibility. He's not just trying to get stronger—he wants to make something real.
Diablo thinks being devoted means being serious about it. He thinks power without a purpose is useless and loyalty is a big deal.
They just fit together.
Rimuru makes meaning, and Diablo really needed meaning. It's not just boss and worker. They're perfect for each other.
Loyalty Before the Power-Up
Here's something people miss: Diablo started following Rimuru before Rimuru got super strong.
When they met, Rimuru was strong, yeah, but he wasn't the demon lord he'd become later. Diablo could have picked someone stronger. He could have waited for someone better.
But he didn't.
Diablo wasn't looking for strength. He was looking for someone worth believing in. And he saw that in Rimuru right away. Diablo was basically like, I knew you were going to be awesome.
He followed Rimuru for what he could be, not just what he was. That's not just believing in someone—that's seeing something special in them. Diablo saw it way before anyone else did.
That's loyalty based on belief, not power. And that's why it matters.
Freedom Is the Best Gift
Most anime leaders rule by being scary or controlling. They tell people what to do, and they do it.
Rimuru? He trusts Diablo to make his own choices.
He lets Diablo fight the way he wants, figure things out for himself, do his own thing. He doesn't tell him what to do or question him. He just... trusts him. For someone like Diablo, who's always been feared or not taken seriously, that trust is everything.
That's why Diablo smiles when he fights. He's happy because he gets to be himself. No rules, no judging, just freedom with someone who likes him for who he is.
People think loyalty is doing what you're told. But real loyalty is choosing to stay with someone, even when you could leave. Diablo could leave anytime, but he stays.
Finding a Reason
Diablo is so devoted to Rimuru because he finally found a reason to live.
Rimuru didn't save Diablo from danger. He saved him from being bored. He gave a super old demon a reason to care, to fight, to protect, and to build something instead of just watching life go by.
Diablo doesn't see Rimuru as a boss. He sees him as his reason to be here. His reason to try in life.
It's not just worship. It's knowing what you're living for and being happy you finally found it.
That's why his loyalty is so strong. It's not just what he does, it's who he is now.
What a Demon Can Teach Us
Diablo's loyalty to Rimuru isn't about strength or respect (though those are there). It's about being seen, being trusted, and finding something worth giving yourself to.
In anime, a lot of characters just follow their leaders because the story says so. Diablo is different. His loyalty is real. Rimuru gave him something he never had in thousands of years: a reason to care.
And honestly, that's stronger than any magic.
So, when you see Diablo smiling like crazy while protecting Rimuru, remember: you're seeing someone who finally found his purpose and is happy to be alive.
And that's pretty cool.
