Tairyokuobake

Tairyoku obake (体力お化け) literally means "stamina ghost" — but obake (お化け) here works more like "monster" or "freak" in English. It describes someone whose physical endurance is so far beyond normal it's almost inhuman. The pattern comes from treating お化け as a suffix meaning "freakishly good at ~" or "an insane amount of ~." You'll see the same structure in other expressions like mentaru obake (メンタルお化け, someone who's mentally unshakeable). It's commonly used on social media and internet forums, often with a tone of admiration or awe.