UE5 Default Mannequin Rig
Designed to not touch the existing hierarchy of the Unreal Engine skeleton for maximum compatibility and ease of export. Features parent space swapping for the head and all the limbs (both fk and ik). There are controls for every possible joint, even the ones that don't affect anything on the default actor.

[2023.06.03] V1.0: Initial Release (47.5MB)
(46MB are due to the included UE5 Mannequin mesh)

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import maya.cmds as cmds

"""Combines multiple curves/shapes together."""

sl_curves = cmds.ls(sl=True)
final_curve = sl_curves.pop(-1)

for cur in sl_curves:
    cmds.parent(cmds.listRelatives(cur, s=True), final_curve, s=True, r=True)
    cmds.delete(cur)
    cmds.select(final_curve)

import maya.cmds as cmdsdef prefixStrip(obj_list):
    """Removes the first set of characters before an underscore"""    out_list = []
    for obj in obj_list:
        split_list = obj.split('_')
        split_list.pop(0)
        out_list.append('_'.join(split_list))
        return out_listdef assignControl(group_prefix, control_prefix, joint_prefix):
    """Applies a control curve with an empty group to every joint selected    First select the control curve, then select as many joints as desired
    afterwards. Original control curve is kept.
    """
    select_ls = cmds.ls(selection=True)
    ctrl_obj = select_ls.pop(0)    if joint_prefix:
        select_ls = prefixStrip(select_ls)
        joint_prefix += '_'
    else:
        joint_prefix = ''
    if not group_prefix:
        group_prefix = 'egrp'
    if not control_prefix:
        control_prefix = 'ctrl'    for current_obj in select_ls:
        current_grp = cmds.group(empty=True,
            name='_'.join([group_prefix, current_obj]))
        cmds.select(joint_prefix+current_obj, add=True)
        cmds.matchTransform(cmds.ls(selection=True))
        current_ctrl = cmds.duplicate(ctrl_obj,
            name='_'.join([control_prefix, current_obj]))[0]
        cmds.matchTransform([current_ctrl, current_grp])
        cmds.parent(current_ctrl, current_grp)
        cmds.makeIdentity(apply=True, pn=True)
        cmds.parentConstraint(current_ctrl, joint_prefix+current_obj)assignControl(group_prefix='egrp', control_prefix='ctrl', joint_prefix='')