Kaido of the hundred beasts... there are a lot of theories about Kaido's devil fruit and all of them seems to be beliveable... Now i will not talk about kaido's devil fruit but lets talk about his pirate crew... The first time when I saw kaido in chapter 795 he reminded me of a Viking.. Now here m not saying that he is a viking or his devil fruit is related to them.. i m just saying that Oda might have given a Viking theme to kaidos crew... we all know that Big Moms crew is simillar to "Alice in wonderlands" characters... So Vikings theme goes perfectly well with the Kaido's crew..
Oda himself is a fan of Vikings but throughout the One piece manga till now he haven't used anything related to Norse mythology.. Well I guess he was saving Norse mythology for a Yonko's crew..
Kaidou's crew are barbaric just similar to the vikings.. We know that kaido executed the Daimyo of Wano.. but the way he executed was very cruel.. he didn't guillotined him nor did he just stabbed him... He boiled the daimyo in a soup... This thing is comparable to the way how Vinking use to execute their enemy...
Kaidou also has an army of artificial Zoan fruit users who are powerful as fuck.. And his a zoan fruit users army can be compared to the Army of Berserks that Viking kings used to have... The berserker was a warrior who never wore any armour but just use to wear animal skin..this warrior had the ability to
induce a state of possession by his
kindred beast, acquiring its strength,
fearlessness, and fury... they use to howl like a wolf in a war.. they were impervious to any weapon nor tbey were affecred by fire.. they were a true best in a war.. And they were very loyal to their king.. even the term "to go bereserk" was derived from this viking warriors... So we can conclude that Kaidou might also have a similar crew.. His epithiet "Kaidous of the hundred beasts" also makes justice if he has such a crew.....