what are the MH shelf warmers?

thanks to r/Barbie for the question, i found it intriguing. i’m new to MH fandom but the G3s got me into dolls. i’m a legit doll person now

thanks to r/Barbie for the question, i found it intriguing. i’m new to MH fandom but the G3s got me into dolls. i’m a legit doll person now