Who Made the Wii? Nintendo.

The Wii was conceived, engineered, manufactured, and marketed by Nintendo Co., Ltd. (Kyoto, Japan).

Key internal teams:

• Integrated Research & Development (IRD) — Hardware (Genyo Takeda).
• Software Planning & Development — System software, Wii Menu, channels.
• EAD / SPD / EPD — Launch titles (Wii Sports, Zelda: TP, Mario Galaxy).

External partners: ATI (GPU), IBM (CPU), Broadcom (Wi-Fi), Foxconn / Flextronics (assembly).

Nintendo owns the platform end-to-end.