Training unit

The training unit (訓練ユニット, Kunren yunitto) is a small humainoid like mech that allows the user to train their skills as a stamen.

Overview
The training unit is used for a stamen to train his piloting skills. It is available for usage anytime and Hiro was often using it before he officially became a stamen due to him failing to synchronize and pilot a FRANXX with no other pistil except Zero Two