Is there any way to create new objects, and have them be associated with existing sprites?

[Grandy12]

I'm trying to give each character an individual shadow, and tried something like;

player = fighters.create(32, game.world.height - 153, 'pCharacter');	player.anchor.setTo(0.5, 0.5); 	player.scale.setTo(2, 2); 	game.physics.arcade.enable(player); 	game.camera.follow(player) 	player.body.collideWorldBounds = false; 	player.animations.add('walk', [0,1,2,3,4], 10, true); 	player.shadow = new Shadow(player);function Shadow(character){	shadow = fighters.create(character.body.position.x, character.body.position.y + character.height / 2 -1, 'shadow');	shadow.anchor.setTo(0.5, 0.5);	shadow.scale.setTo(2, 2);	game.physics.arcade.enable(shadow);	shadow.body.collideWorldBounds = true;	shadow.body.setSize(31,4,0,6); 	shadow.body.immovable = true; }

I thought this would create a new object that could be manipulated with 'player.shadow' (as in, player.shadow.body.x = player.body.x), but it didn't work; player.shadow returns "Shadow { }"