Creating an oni-themed outdoor seating area involves blending traditional Japanese demon motifs with functional design. Start by incorporating bold, dark colors like deep reds and blacks, reminiscent of oni masks. Use furniture with angular, exaggerated shapes to mimic the fierce appearance of these mythical creatures.

Add carved wooden elements or metal accents featuring oni faces or kanji symbols for authenticity. Lighting plays a key role—opt for lantern-style fixtures with red or orange hues to evoke an eerie yet inviting atmosphere. For textiles, choose cushions or throws with wave patterns (seigaiha) or other Japanese-inspired designs.

Natural materials like dark-stained wood or stone enhance the rugged, mystical vibe. Finally, consider adding subtle touches like miniature torii gates or bamboo fencing to complete the theme while maintaining comfort for guests. This fusion of culture and creativity transforms ordinary outdoor spaces into striking oni-inspired retreats.