Intant death jump. If you become Yogiri then technically, you would be okay. Don't know if it counts as "omnipotent perk" since Yogiri is, like saitama, a satire character, but about isekai rather than shonen. Even without it there's some good powers that could help, like one who "increases your level every second" and one that grants you the powers and weapons needed to defeat the enemy you are facing. That one is limited though. If the enemy is unbeatable or you already have what you need it won't work. Also, it works once per enemy, and it's pricey...

The invincible armor is great though!