User blog comment:IamJakuhoRaikoben/Chapter 470: The Hybrid Theory, Review./@comment-27674224-20160126181825/@comment-5672982-20160129235615

Likely, if God Serena has DS that is supposed to reflect Gajeel's DS in some way, Diamond would be the best bet, as Gajeel can already do steel type attacks as a variation of his Iron DS magic.