Hifumi Yamada, is a student in Hope's Peak Academy's Class 78th, and a participant of the Killing School Life featured in Danganronpa: Trigger Happy Havoc. His title is Ultimate Fanfic Creator.
- His basic personality is little more than a stereotypical Otaku.
- Speaking of his Otaku nature, he's absolutely obsessed with an anime called Demon Angel☆Pretty Pudgy Princess (and no, we're not making that name up), and claims that Princess Piggles, the protagonist of said anime, came to him in a dream and that he fell in love with her when on a date. And ever since, he began purchasing all the Princess Piggles merchandise he could find and drew nothing but her since he couldn't show his love any other way (to the point where he created a personal website displaying his artwork of Piggles), all over a cartoon character he fell in love with.
- He acts perverted towards 2D women and has a really unsettling and creepy crush on Alter-Ego, who, keep in mind, isn't a real person, but a program. So much so that he actually goes as far as to murder someone over them.
- More often than not, what comes out of his mouth are overreactions over every little thing. This can come off as funny at first, but soon it gets really annoying.
- His design is incredibly strange and unappealing, he looks more like a guinea pig rather than an actual human and it's easily one of the least appealing designs of any character in the Danganronpa series. He looks worse in the Closing Argument for the trial as the artstyle makes him look like a deranged hippo.
- His voice is very nasally (a common nerd stereotype) and can also get rather annoying.
- In his Free Time events, he mentions angrily lashing out at girls whom he believes want to spend time with him out of pity, which is just ungrateful. And even Makoto Naegi, one of the nicest and most forgiving characters in the entire series, doesn't approve of it, understandably.
- While he was arguably already pretty unlikable, the moment he truly became widely hated by the fanbase was when it was revealed he gleefully murdered Kiyotaka Ishimaru, a fan favorite, in cold blood the second Celestia Ludenberg told him that he had abused her and had kidnapped Alter Ego with plans to kill Hifumi as well. While this is a mainly understandable motive for murder, but there's still the fact that he did it with no actual proof (he never bothered asked Taka or anyone else if he actually did it or anything). But it is still can be seen as understandable given how much Hifumi admired Celeste and how Taka's recent strange behavior after he became his split personality, Kiyondo, but then there's the fact that he was completely okay with having everyone besides him and Celeste killed all to get his so-called "revenge", which makes absolutely no sense. Seriously, what did the other students have to do with what Celeste told him about Taka?
- It also isn't helped by the fact that Taka had just found a way of coping with Mondo Owada's death and therefore a reason to move on, only to die not long after. And it was because of him being murdered that he was never able to finish his character arc.
- He serves little to no real purpose to the story. If you remove his him from the game, little to nothing would really change. This is taken to the extreme in the manga, where most of his scenes are cut and he literally just mostly stands in the background, bar his interactions with Celeste and his death. And while, make no mistake, every character in the Danganronpa series does add something to the plot, Hifumi's one of those characters who adds very little to it.
- While he did it with no evidence and way to eagerly, he only killed Kiyotaka because he thought he had abused Celeste. And given the situation (where if he didn't act quick it would mean both his and Alter Ego's lives would be on the line, and how highly he thought of Celeste, combined with Taka's recent odd behavior), it does make his murder (excluding him trying to get everyone else killed later) more understandable.
- He can be pretty hilarious at times.
- In a Free Time Event, Makoto learns that Hifumi actually has an altruistic dream: because he realizes that there are some people who only read fanfic casually, or only certain kinds, he wants to inspire those people to create their own fanfics, so he can "save" those people by giving them a direction in life, as his favorite anime character Heretic Angel ★ Mochi Mochi Princess did for him, which is how Hifumi got into the fanfic business in the first place. And even before that, he did make an effort to be respectful towards his peers in the beginning.
- While most of his Free-Time Events have him rambling on about fandom-based topics, in his final Free Time Event, he chooses to call Makoto a friend.
- He can be quite useful during the Class Trials, unlike most of the cast.
- He doesn't kill Taka in Danganronpa: The Stage, where he instead commits suicide and Hifumi and Celeste simply take the fall for Sakura's suicide and are both executed for voting wrong, with the implication that Hifumi had no idea that Celeste was innocent (for her part, it's implied that Celeste did this on purpose to escape the school by dying).
- In the Japanese dub, he's generally polite, especially to Celeste, referring to everyone with honorifics.
- Hifumi's Japanese voice actor, Kappei Yamaguchi, also voices Jin Kirigiri in the Danganronpa: Trigger Happy Havoc.
- In School Mode, he admits that he enjoys singing karaoke of anime themes with his online friends whenever they meet.
- Hifumi's English voice actor, Lucien Dodge, also provides the voice for K1-B0.