User blog comment:Bato of the Heavy Iron Rock Hammer/Will mentioned characters make an appearance?/@comment-108.28.233.191-20140719073006

It's unlikely that Reisha Whiteday, and Belinka Lilacfille will appear, though arguably Reisha Whiteday's already gotten a few cameos.

Those two are obvious references to Reisha Valentine, and Belinka of Rave Master fame. White Day being the companion holiday to Valentine's Day in Japan. And Belnika's last name there I'm pretty certain translates better to "Lilacfille". Fille meaning girl/young woman, and lilac being a light shade of purple. Which would fit Belnika whose hair could be described as lilac in color. Hound Holy of course would be a reference to Plue, a "dog" associate with the "holy" Rave stones.

You could argue that some of the cameo's of Elie were of Reisha Whiteday.

It's kind of unlikely they'll appear though, as Mashima opted to do a real crossover eventually.