It looks like a humanoid version of the ULTIMATE type of fuselage loadout from SolaToRobo from beating the game several times and then paying 60,000 rings for the ultimate fuselage.
controls (IMPORTANT for the ultimate type) :
If you Hold A and release with the ultimate mech you can grab things with greater reach. If you hold A and allow yourself to get hit damage is MAJORLY reduced by a blocking with the arms technique to protect the pilot and stand your ground, though shielding causes immobility and you have to release the button to be freed from immobility.
If you press B ten immediately press it again you do a rocket dash, which is a dash that can be controlled by the D pad. hold B to get a more advanced version, release to send a wave of power surges at your enemies and actually get a reaction out of them, press B and while in mid air to hover, good for avoiding bosses lasers and other jump-timed hazards.
press Y to dismount (obviously), press A and while holding an enemy in its "combo ring" press A and a series of
button mashes on the D-pad, whatever direction you button mash the D-pad in affects the move.
wen A is rapidly pressed while the enemy is in mid air; this causes more damage.