All of Luka's potential image items are here.

Not all of them. There are more, sadly...but now that TakoLuka has arrived, it seems tuna should be the clear winner.

Who the heck voted for a shovel? People are strange.

Meiko wants to use it to dig Luka's grave <evil, manaiacal laughter goes here>

Kayako said:
Who the heck voted for a shovel? People are strange.

That's because you don't get the Jojo reference. It's a reference to Weepy-Eye Luka, a character whose weapon is a shovel. Surely I don't need to explain why they made this reference.