Defeat the indicated characters in Hero mode to unlock the masters for the corresponding body types.

Masters	How to unlock
All Body Sizes (Android #17 and Android 18)	Defeat Androids #17 and #18.
All Body Sizes (Frieza, Cui and Trunks)	Defeat Omega Shenron (First fight).
All Body Sizes (Majin Vegeta, Ultimate Gohan and Cell)	Defeat Omega Shenron (Second fight).
All Body Sizes (Piccolo, Raditz and Bardock)	Defeat Piccolo.
All Body Sizes (Tien and Captain Ginyu)	Defeat Captain Ginyu.
Heavy Hero (Legendary Super Saiyan Broly, Super Janemba and Super Vegito)	Defeat Ultimate Shenron (Boss battle).
Light Hero (Goku, Vegeta and Teen Gohan)	Defeat Great Ape Baby (Boss battle).
Light Hero (Super Gotenks, Super Gogeta and Super Vegito)	Defeat Ultimate Shenron (Boss battle).
Standard and Heavy Hero (Goku, Vegeta and Nappa)	Defeat Great Ape Baby (Boss battle).
Standard Hero (Super Janemba, Super Gogeta and Super Vegito)	Defeat Ultimate Shenron (Boss battle).