Corallo/guide

Ornament
Enter the Ocean Floor. Go down to the white coral. Go right, then down. Head south-west until reaching the red and green seaweed. Go up and walk towards the mermaids. After they disappear, go back to the Ocean Floor's entrance. Go down to the white coral, then go left. Interact with the red ornament.

Jellyfish
Enter the Ocean Floor. Go up a bit and right. Go up the middle of two rows of seaweed and enter the door. Go up the stairs and enter the door at the top. Interact with the jellyfish on the stand.

Axe
Enter the Bloody Girls World. Go south-east and enter the head surrounded by NPCs. Go right through the hall into the Hotel. Go up the stairs onto the second floor, then up the stairs to the third floor (walk along the LEFT wall when going up these stairs, or else you will be taken back to the first floor). Go right and enter the door. Go up until the ghost disappears then leave the room.

Go left and head downstairs to the first floor. Interact with the axe on the floor.

Legs
Enter the Beach House. Enter the door on the left. There is a chance that a flashing pink and purple beach will be on the shore. Interact with it and you'll be teleported to a snowy beach. Go right and enter the house. Go down and enter the door. Go north and interact with the legs on the ground.

Or

Enter the Bloody Girls World. Go south-west and enter the head that's in a horizontal trail of blood. Go north and interact with the legs on the ground.