Volume 25 Bonus Chapter Translated : r/OnePunchMan

The Volume 28 bonus chapter is about Watchdog Man! : r/OnePunchMan

Volume 25 Bonus Chapter (and Extra Illustrations) : r/OnePunchMan

Vol 24 extras (The rest in Vib's post) : r/OnePunchMan

All illustrations and bonus content from volume 26 : r/OnePunchMan

OPM Volume 26 Bonus Chapter Review: Big Promotion [LONG] : r/OnePunchMan

Vol 24 extras (The rest in Vib's post) : r/OnePunchMan

Inside Cover and Back Cover,Bonus Chapter and Extra Illustrations from Volume 26 (Scan/HQ) : r/OnePunchMan

Volume 25 Bonus Chapter (and Extra Illustrations) : r/OnePunchMan

One-Punch Man, Vol. 25 (25) by ONE

Who's the most powerful foe in One Punch Man? - Quora

Volume 25 Bonus Chapter (and Extra Illustrations) : r/OnePunchMan