Yes. He has a full Auto-Rig Pro body rig with fingers, plus face controls for the jaw, lips, eyelids, eyebrows and tongue.

No, you can pose and animate with plain Blender. You only need Auto-Rig Pro for its own tools, like IK/FK snapping and the rig panel.

Yes. Use the fatty, builder and skinny shape keys. They are on the body and on every clothing piece.

Swap the shirt material between the four shirt colors and the trouser material between the three trouser colors in Material Properties.

Yes, but the hair is part of the same object, so hiding it leaves a bald head. To keep the hair, go to Edit Mode, select the hair by its hairs material and separate it (P > By Material).

FBX and GLB files are included. They should import into common engines, but they have not been tested in each engine, so check the rig and shape keys after import.

Yes, under the Royalty Free license you can use it in commercial renders, games and videos. You cannot resell or share the model files themselves.