Not every Isekai hero has the luck of the draw, as their reincarnation story is overwhelmed with hardships and tragedies as they face the impossible tasks ahead of them with barely any assistance. Meanwhile, others are bestowed with unimaginable blessings, transforming the unsuspecting adventurers into memorable powerhouses who dominate their respective new worlds.
Generally, whichever God is involved in the reincarnation process dishes out an Isekai Bonus to the lucky recipient, which is essentially a "cheat skill" to help with their otherworldly travels. Oftentimes a comprehensive understanding of languages also gets included, but it's the truly unique power-ups that make the best impressions!
9 Dimensional Travel: Mitsuha Yamano (Saving 80000 Gold In Another World)
Some Isekai heroes are fortunate enough to travel between worlds, like the iconic Kirito (Sword Art Online) and his many "reboots." However, more often than not, their dimensional travel ability has a mind of its own and cannot be invoked at the most opportune time. Except in Mitsuha's case!
After falling to her death, Mitsuha awakens in a strange medieval land but soon discovers she can teleport back to her modern Japanese life. Preparing for the future, this resourceful entrepreneur begins transporting contemporary items back to the historical otherworldy setting, where she opens a revolutionary shop to sell her unique wares. Luckily, Mitsuha also benefits from her language-learning bonus and nifty healing powers, and is well on her way to the retirement of a lifetime!
8 All-Purpose Farming Tool: Hiraku Machio (Farming Life In Another World)
Hiraku could've asked for any Isekai Bonus imaginable, and yet he chooses a tool, some solitude, and communication skills. It may not seem like fair compensation for his miserable life, but things work out much better than expected for the agricultural enthusiast.
So long as it's farming-related, Hiraku's versatile All-Purpose Tool can transform into any piece of equipment, perfectly suited for his extensive needs. Furthermore, it reduces the strain of hard labor, turning Hiraku's dream of singlehandedly building a self-sustaining village into a reality. He is well rewarded for his efforts and becomes the object of every local girl's affection, unintentionally collecting a ridiculously huge harem of supernatural beauties, who keep him very busy indeed!
7 Incredible Taming: Rein Shroud (Beast Tamer)
Rein is unceremoniously ejected from his party for allegedly being useless, and only once his solo adventure begins, does the world realize how insanely overpowered this young boy is. In every other instance, only one beast can be tamed at a time, and having multiple minions is unheard of. However, Rein's taming capacity is seemingly limitless, allowing for entire hoards of critters to enter into his service simultaneously.
If this taming skill isn't OP enough, Rein is also capable of wielding his beasts' power and gets a bonus boost with every new contract formed. He has subsequently aligned himself with some of the most powerful creatures, demi-humans, and demi-gods in existence. If Rein can't get the job done, his overpowered harem of potently beautiful beasts certainly will!
6 Return by Death: Natsuki Subaru (Re: Zero)
Subaru's situation is both a blessing and a curse. True, he is essentially immortal. However, every time he gets "resurrected," Subaru maintains the traumatic memories of past deaths, which takes a toll on his mind. Eventually, the youngster learns to use his affliction to his advantage, creating a "Save Point" of sorts whereby he can try again, with more knowledge and experience the next time around.
Whenever Subaru tries to tell others about his Return By Death Isekai Bonus, he basically activates the ability and is "reborn" before his secret can be shared. However, this burdensome side-effect can also prevent an unfavorable outcome before it happens, giving "Barusu" the upper hand over his enemies. Each death is as painful as the last, but at least this brave hero gets the chance to power through and try again!
5 Advanced Skillset: Ryoma Takebayashi (By The Grace of Gods)
Death-by-sneeze is certainly not an admirable way to go, but at least Gain (The Creator), Lulutia (The Goddess of Love), and Kufo (The God of Life) take a liking to Ryoma. They each bless him with their Divine Protection along with the capacity to use every form of magic available in Seilfall, making him a jack-of-all-trades, but master of none. And if necessary, Ryoma can always contact the Gods with his Oracle Skill.
Although reincarnated as an eight-year-old, Ryoma is incredibly independent and survives for years in solitude with only his slimes for company. During this time, he discovers the key to slime evolution and creates a sublime collection of specialized slimes capable of performing a wide variety of feats, from cleaning, poisoning, healing, and more. The boy's already elevated skillset is improved with each new slime in his service, and his troupe is in the thousands!
4 Enkvaros' Ring: Diablo (How NOT To Summon A Demon Lord)
Not only was Takuma Sakamoto able to reincarnate into his high-level Sorcerer character from his extensive Cross Reverie gameplay during his human days, but this Diablo also accessorizes! True, Enkvaros' Ring is not an official Isekai Bonus; however, it comes pre-equipt after Takuma's summoning, so it technically still counts.
This potent piece of jewelry reflects any magical damage inflicted on its wielder, making Diablo practically invincible (although it also means that healing and support magic is ineffective.) This is a simple sacrifice for the one true Demon King, as he is evidently powerful enough to survive without needing much restorative magic. Socially inept, sure, but potent nonetheless! Diablo's skillset is so unbelievable that he simply can't fight at full capacity, as he would instantaneously flatten his enemies, which would be no fun for anyone!
3 Blessing and Devouring: Myne (Ascendance of a Bookworm)
Besides the Futuristic Wisdom pushing Myne ahead in life, this bookworm also has an exceptional mana capacity equal to that of the highest of nobles. This power-up causes an illness known as the Devouring, which can thankfully be suppressed with mana-draining equipment. With Ferdinand's assistance, Myne learns to channel her mana more efficiently, becoming the youngest high-level magic wielder in Yurgenschmidt.
Myne is not selfish with her good fortune and shares her Blessings with those in need, and is particularly skilled at complimenting the Gods, which in turn urges them to share their powers. She can call upon multiple Deities or Elements at the same time and fuel her blessings even further with her seemingly unlimited supply of mana.
2 God-Class Mana Reserves: Makoto Misumi (Tsukimichi: Moonlit Fantasy)
Makoto immediately gets mistreated by the Goddess in charge of his reincarnation, who deems him to be too hideous to receive a decent cheat skill. Fortunately, genetics and Tsukuyomi are on his side. As it turns out, Makoto technically originates from this other world, and his inherent hyuman characteristics can finally reach their full potential! Additionally, it seems that Earth had a similar effect on his body as the Gravity Chamber does on Goku and the clan in Dragon Ball Z. However, this new world has alleviated the pressure, creating a superpowered entity as a result.
Before parting ways, Tsukuyomi managed to leave Makoto with a few gifts of his own, including the multifaceted Sakai skill (including healing, strength, mobility, etc.) The young hero is also proficient at Creation magic, which is usually only reserved for the Gods, and is an expert marksman with a bow. An all-rounder, by anyone's standards; except perhaps the shallow Goddess.
1 Predator Mastery: Rimuru Tempest (That Time I Got Reincarnated As A Slime)
Rimuru may have an extensive array of abilities at his disposal. However, Predator is arguably this slime's claim to fame. With these unique skills, Rimuru can earn power-ups and stat improvements with every worthwhile absorption, be it physical, magical, or otherwise. Everything has the potential to become his "prey," arguably making Rimuru the best one-man army in Isekai history!
For the most effective Predation, it's best if the intended target is unconscious (or better yet, dead!) The consumed elements are all appraised and can then be replicated at will, or simply stored away for a rainy day. The world is Rimuru's oyster, and he's one hungry, slimy fellow. Who knew upgrades could be so tasty?