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{{Infobox/Yu-Gi-Oh!/Charactercharacter | image name = FearsomeFourIntroFearsome4OfTheDarkDuelingWorld.jpgpng | image size = | japanese name ja_name = 闇デュエル界 四悪人 | romaji name romaji_name = Yami Dyueru-kai Shi Akunin | english name en_name = Fearsome Four of the Dark Dueling World | asian english name ja_trans_name = Fearsome Four of the Dark Dueling World | anime debut anime_debut = {{episode|Yu-Gi-Oh! ZEXAL|112|ref}} | appears anime appears_in_anime = [[Yu-Gi-Oh! ZEXAL]] | affiliation organization = [[Barian World]]{{Infobox/Yu-Gi-Oh!/Misc/Other | title = Members | hidden = true |* [[Kurage]]* [[Kaninja]]* [[Mr. Heartland]]* [[Semimaru]]}}

The "Fearsome Four" were originally a gang of underworld Dueling criminals working under [[Mr. Heartland]]. All of them except for [[Mr. Heartland]] died tragically and were eventually reincarnated recruited as [[Barian]]sby [[Vector]] to aid the former. Later on, Mr. Heartland eventually joined them after falling through a portal and ended ending up in the [[Barian Sea of Ill Intent]].

During Later in the [[Yu-Gi-Oh! ZEXAL II]] arcseries, Heartland was eventually revived by [[Vector]] using the power of [[Don Thousand]], though his form was that of a fly. Later on, Vector restored Heartland into his normal human form and summoned the other members of the Fearsome Four to accompany him in his journey to take the "Numbers" from [[Yuma Tsukumo]], [[Reginald Kastle]] and [[Kite Tenjo]].

Being Barians, the Fearsome Four have superhuman abilities such as teleporting and taking into alternative forms that give them unique abilities, such as [[SemimaruErazor]] being capable of stealing memories and , [[KurageChironex]] capable of becoming invisible living water and poisoning othersand [[Scritch]] being able to turn into a mosquito at will. They have also shown the ability to alter a Duel by using a [[Crest]] akin to that of [[Don Thousand's Emblem]]'s emblem to halve the opponent's Life Points and add it to their own at the very beginning of the Duel, effectively cheating.

Each member has an alternate form based on different invertebrates.These are all often considered pests by humans, with the reasons for this ranging from being plain annoying to carrying deadly diseases. Each member also carries a "Number" ranging from 1 to 4 given to them by Vector. These were, however, [[Barian Number|fake]] "Numbers", ultimately self-destructing along with Mr. Heartland when all of the Fearsome Four were defeated. The numbering of these fake "Numbers" carried several obvious puns with them, such as "Number 4: Stealth Kragen" being used by Chironix against [[Quattro]], which the latter pointed out when it was summoned. 

| [[Number 1: Infection Baal ZebulBuzz King (anime)|Number 1: Infection Buzz King]]

| Defeated Deceased ("Numbers" "2", "3" and "4" taken from Kite Tenjo, Trey and Quattro; defeated by Yuma and Astral)

! [[KaninjaScritch]] | [[Number 2: Ninja Shadow Mosquito Ninja]]

| Defeated Deceased ("Number 2" taken by [[Kite Tenjo]])

! [[SemimaruErazor]] | [[Number 3: Hell Cicada King - Locust King]] | [[File:SemimaruErazor fullbody.png|center|100px]]| [[File:SemimaruformErazor form.png|center|100px]] | Defeated Deceased ("Number 3" taken by [[Yuma Tsukumo|Yuma]] and [[Trey]])

! [[KurageChironex]] | [[Number 4: Stealth Kragen the Deadly Poisonous Jellyfish]] | [[File:KurageZeXal anime.jpgpng|center|100px]]| [[File:KuragetrueformChironextrueform.jpg|center|100px]] | Defeated Deceased ("Number 4" taken by [[Quattro]])

* [[KurageChironex]] and [[Mr. Heartland]] are is the only members member whose alternate form isn't is not an insect.<ref name="e114">{{episode|Yu-Gi-Oh! ZEXAL|114|ref}}</ref><ref name="e123">{{episode|Yu-Gi-Oh! ZEXAL|123|ref}}</ref>** Although Mr. Heartland did have another form where he appeared as a fly with a very small human head.* All members had their past lives.*There has been a pattern of He is also the rows each one of them would have in their respective duels: **[[Semimaru]], only member who appeared first, took used the Barian Emblem against his opponents by asking first turn in his [[Duel]];and having them agree to it instead of cheating against their will.**Kurage, the second member of the group that has appeared, took the second turn in his [[Duel]];**[[Kaninja]], They are the third member only Barian-related characters who do not use any form of the group that has appeared, took the third (and last) turn in his [[DuelRank-Up]].