twin turbo (umamusume) (prototype)
A character featured in the Umamusume 2016 PV.
It is speculated among fans that she was Twin Turbo's original design, but there is no confirmable source. She does not appear anywhere else in the series, and is presumed to be a scrapped design.
Usually referred to as "Old Turbo", "Prototype Turbo", or "Proto Turbo".