Soul of Chogokin(超合金魂,Chōgōkin Damashii?) or "Soul of Super-alloy", is a popular line of adult collector's toys produced by the Japanese company Bandai.
The line, which began in 1997, focuses almost exclusively on mecha (robots) taken from various 70's/80's anime series, although the line has diverged from this on a number of occasions, most notably the release of several mecha from the mid-90's anime Neon Genesis Evangelion. More recently, the line has expanded further to include mecha from 70's Super Sentai and Tokusatsu series, such as the Battle Fever Robo from Battle Fever J and Leopardon from the Japanese TV adaptation of Spider-Man.
Even though they were never too difficult to find, the following versions were never released in shops. Most of them required the use of coupons found in manga/magazines/CDs. Some were released in fairs/exhibitions.
Restyling Gold. Tamashii Expo 2004 Pre-Exhibition
Weathered paint. Tamashii Nation 2008. Limited to 3000 pieces.
Sold at the "40th Anniversary of Go Nagai's Works" exhibit
Mail-in coupon from the manga "Mazinger Z Angels (魔神天使 Z)", vol. 1
Mazinger Angels Snow white. Mail-in coupon from Magazine Z
Mazinger Angels La Sirene De Noir
Mazinger Angels Shining Shadow. Mail-in coupon from the manga "Mazinger Z Angels (魔神天使 Z)", vol. 2
Mazinger Angels Marine Blue Mermaid
Mazinger Angels Queen of Gold
DVD Special Edition. Mail-in coupon.
Naked version. Sold at Spring 2009 Tamashii Nation Expo
limited metallic version. Mail-in coupon from the book "Soul of Chokogin Project (超合金魂計画)" vol. 3
Atami Night version. Sold at Autumn 2009 Tamashii Nations Expo
Proto Type. Mail-in coupon from the book "Soul of Chokogin Project Z (超合金魂計画 Z)"
Normal Color version. Sold at Autum 2010 Tamashii Nations Expo