Ultraman: Feed my daddy

This book, also known as *Ultraman: Matching You with an Equally Powerful Daddy*, tells the story of Takahashi, who transmigrates to the world of Ultraman Tiga and gains a supposedly absolutely fair competitive advantage: the ability to transform into any Ultraman. But why is his enemy the S++ level Eternal Shining Gatanothor, while his Ultraman form is the S-- Shining Tiga?! Is this the fairest ELO matching system in history? Every time he transforms, the ridiculous matching system draws the weakest Ultraman for him. In every battle, Takahashi's enemies are strengthened by Sphia and other strange characters. His teammates are all heavyweights: a battered and bruised Tiga who fights the entire battle; Dyna, corrupted by Sphia and prone to berserk rages; Seven, whose divinity is maxed out and who doesn't love his friends; and Leo, wallowing in the grief of losing his homeland. And every now and then, even more enemies intrude into this world whose difficulty has gone completely out of control. Root Destruction Entity, Demon Beast, Chaos Head, Negative Energy Monster… Greeza, Emperor, Reiblood Alien, Zagi… Fortunately, the original human hosts of these worlds will also arrive in this world. Gaia, attempting to destroy humanity; Cosmos, resolutely upholding justice; Max, actively intervening in humanity's dark side; Mebius, donning the armor of vengeance; Nexus, cowardly and afraid of death… Why are my teammates either crippled or terrible? The only reliable teammate is the little plane from the GUTS team. In short, one god carrying four noobs, every match is a peak performance, and any mistake leads to a disastrous end. Takahashi says, "Merging the Great World, don't come if you're a cheater!"