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Even After Four Seasons, Reincarnated as a Slime VAs Miho Okasaki, Megumi Toyoguchi Still Find Their Roles Challenging

Beloved isekai series, That Time I Got Reincarnated as a Slime, approaches its eighth year on air. The anime adaptation of Fuse's web novel started in 2018 and still welcomed a full house of eager fans during its Anime Expo 2026 panel. Currently, Rimuru is trying to create a space for humans and monsters to peacefully coexist, but faces an uphill battle with the Rozzo family and others. Betrayal, friendship, and epic demon battles still remain a core pillar to the series, and provide a spectacle that keeps fans coming back.

Voice actors Miho Okasaki (Rimuru) and Megumi Toyoguchi (Raphael) spoke to Anime News Network about their time together (so far) as the duo, and even shared a behind-the-scenes look into their own chemistry.

ANN: How would you describe Rimuru and Raphael's relationship? And how has it evolved over the seasons?

MIHO OKASAKI: When (Rimuru) first encountered Raphael, they honestly had no idea what it was. Later on, it was revealed that Raphael was actually a skill.  People may think of a skill as just a function especially as the way Raphael spoke was rather robotic as Great Sage. But over time, and through evolution, Raphael has become very human. Now, it feels like the two are just like inseparable partners. Raphael is the one that Rimuru relies on all the time. But, I think there's something special to Rimuru about the fact that Raphael is a presence only they can sense. Even when they're panicking on the inside, if Raphael gives them the answer, they can make it look like they figured it out themself. Even so, through all of that, they've built a real bond. Watching that relationship grow, and seeing that emotional connection deepen over time, is one of the things I really love about them.

MEGUMI TOYOGUCHI: As the story goes, the relationship between Rimuru and Raphael has deepened over time. Originally, Great Sage Raphael is a skill, so Raphael is not supposed to have changing emotions. So, I—or rather Raphael—may not be supposed to have any desire to support Rimuru, but I personally feel from the dialogue that the desire to support Rimuru has gradually grown stronger in Raphael.

ANN: Similarly, have you both spoken to each other about Rimuru's trust in Raphael, like at the end of Season 4, where Raphael smiled after Rimuru referred to Raphael as “partner?”

OKASAKI: Yeah, of course, Rimuru puts complete trust in Raphael. Raphael is always the one who guides Rimuru, whenever Rimuru is in trouble. That's what makes Raphael truly irreplaceable, as Raphael sees from the perspective of Rimuru. That's why I think Raphael is Rimuru's one-and-only partner. The distance between them feels very comfortable. Rather than facing each other and talking, it feels more like they're sitting side by side at the bar counter or walking side by side. They may not need to exchange a nod, but they share the same understanding, and I find that really comforting.

Not only with Raphael, but in general, we don't usually discuss beforehand how we're going to approach our performances during recording. In fact, ever since Raphael was Great Sage, we haven't talked about how we're going to play our scenes. But during the test recording, there are moments when I think, "Oh, so that's how she is playing it!" It always makes me smile. That's become one of the things I look forward to during recording; I feel there's something special about not discussing it beforehand.

ANN: When the TV anime began, Raphael was basically an emotionless computer. However, after evolving, how do you feel Raphael has changed?

TOYOGUCHI: After evolving into Raphael, the biggest challenge was finding the right balance. Raphael had originally spoken like a computer, but as a little bit of emotion began to come through, it became difficult to figure out how much emotion I should bring into the performance. I'm still adjusting that balance. There was one recording session where the director and I talked beforehand about whether I could bring out a little more emotion. It was a scene where those feelings naturally came through, so I decided to lean into it a bit more. But in the end, I think I went a little too far. So even now, I'm still fine-tuning that balance. 

ANN: While usually happy and kind, in the battle against Falmuth, Rimuru killed 60,000 people—many more than Rimuru needed to in order to become a Demon Lord—just in the name of revenge. Do you feel that this makes Rimuru objectively a villain? Do you believe that Rimuru can ever be redeemed? Or do they even need to be?

OKASAKI: That is a difficult question. Whether someone is considered good or evil depends on the perspective from which you view them. I think that's true not only in the world of That Time I Got Reincarnated as a Slime, but in the real world as well. It even makes me wonder whether forgiveness and being forgiven truly exist in the first place.Rimuru acts according to their own convictions, not out of prejudice.

Personally, I want to support them. They're not the kind of person who acts simply to make themself look good. Rather, their decisions are driven by their desire to protect their friends and help the nation prosper. In that sense, I really hope people don't end up hating them too much. Now that they have so many people depending on them, they may have to make choices like the one they made during Megiddo again. But I never thought that decision would come easily to them. I did find it frightening!

How do you go about subtly injecting emotion and sarcasm into your performance?

TOYOGUCHI: I think I probably have a tendency to overdo it. There were quite a few times during Season 4 when I felt I'd gone a little too far. As I mentioned earlier, I'm still working on making Raphael's emotions feel subtle and natural. Because of the COVID-19 restrictions, we often had to record separately instead of together during Seasons 2 and part of Season 3. I don't think I ever had to record completely by myself. But now we're back to recording together and playing off one another.

Ideally, it's best when we can perform together and play off each other. But even if Rimuru becomes very emotional, I can't let myself follow them to that same level because Raphael has to stay much more restrained. So whenever I play Raphael, I'm constantly holding my emotions back. Holding them back is actually the hard part. During breaks, I tend to chat with everyone, so my energy naturally goes up. I try not to get too excited, but I always end up having so much fun that my energy rises anyway. So when recording starts, I spend the whole time bringing myself back down, telling myself, "Empty your mind. Empty your mind."

ANN: Throughout the past four seasons, the audience has seen Rimuru grow from an easygoing personality to a proper leader. What helps you act as Rimuru when they show a mature side, like when Rimuru self-reflects at the end of the latest season?

OKASAKI: Rimuru has certainly grown through everything they've experienced up to Season 4. But I also think that the parts of them that are thoughtful and love freedom were always there from the beginning. Depending on who they're talking to, different sides of their personality are brought out, which changes the impression they leave on others as well. In the same way, as Rimuru goes through different situations, different aspects of their character come to the surface. I think it's really about the resolve they have in each situation. So rather than deciding, "This is the kind of person Rimuru is," based on a particular episode, I try to understand them from many different angles. When I'm standing in front of the microphone, though, I try to bring myself as close to Rimuru as possible.

Rather than observing them from a distance, it feels more like I'm letting Rimuru come through me. Because of that, there are times when it's difficult to put into words exactly how I approached the performance. The final part of Season 4 was one of those moments. I've spent such a long time with Rimuru that now they come out quite naturally. Of course, if the director tells me, "That's not quite Rimuru," then I step back, look at the performance objectively, and think about what I can adjust to better convey the character. That's when I started fine-tuning the performance. However, on the first take, it feels more like I'm letting Rimuru come through me.

ANN: I read that you gave some advice to Okasaki-san on the delivery of,「チョ待てよ」(Cho, matte yo!*) or Wait a second!, during the court scene where Rimuru and Kaijin are sentenced in season one? Were there other times you helped her?

TOYOGUCHI: It's so funny hearing, "Cho, matte yo!*" in the middle of an English question. I had completely forgotten about that line.

OKASAKI: First of all, I was familiar with the line "Cho, matte yo!* (Wait a second!)” that a Japanese actor, Takuya Kimura, delivered in several TV dramas. I never imagined that I'd actually have to perform it myself because KimuTaku (Kimura-san's nickname) is a man and I'm a woman. When I started wondering how I should approach it, rather than waiting for someone to tell me exactly how to do it, I figured they were probably looking for a slightly exaggerated take on it. So I watched Takuya Kimura-san himself, then Hiroto-san—who's famous for impersonating him—and finally Megumi-san (Toyoguchi), who's especially good at capturing KimuTaku's signature intensity in his eyes. Rather than teach me how to do it, Megumi-san demonstrated it for me. In the end, I blended all three influences together to create that moment.

*Note: "Cho, matte yo!" ("Hey, wait a second!") became one of Takuya Kimura's well-known lines because of his distinctive way of saying it in several TV dramas. Today, it's widely recognized as his signature phrase used in impersonations of him. Kimura even references his own famous line as Takayuki Yagami in SEGA's game, “Judgement.”  

TOYOGUCHI: How did it come across in the English version? What was it like?

ANN: The English dub doesn't translate the line and replaces it with, “Whoa, what just happened?”

TOYOGUCHI: Actually, when it comes to "Cho, matte yo!,” our director does it all the time. He's probably the best at it.

OKASAKI: I was so nervous about performing it for the director that I asked Megumi-san for advice beforehand.

ANN: You originally started voicing Rimuru two years after your debut as a voice actor. Now that it's been over eight years in this role, what are you excited to do as Rimuru?

OKASAKI: The story continues much further in the original novels. Although the anime is adapted from the manga, I think it will continue following the novel's overall storyline. So my biggest challenge is to help bring everything Rimuru experiences to life through the anime. Just like this trip to Los Angeles in America, I'm sure being part of That Time I Got Reincarnated as a Slime will continue to bring me exciting new opportunities and challenges. As someone who considers herself a late bloomer, I'm grateful for every one of them. But above all, my greatest challenge—and something I feel I've been striving for all along—is to help bring Rimuru's journey to life as they live through the story.