[quote=Yog Sothoth]
Elijah does have fairly different powers since he uses lightning, comparing the two is like comparing Superman and Captain Marvel. Also Isaak is far more flawed in personality, St Michael is more about leading by example while St Elijah is more angry with the world and how it is sinful. I haven't added his history yet, but it will be fairly different from St Michael in several different ways several
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He is still a physical type character though, and even being different from St Michael we still have two lightning users already.

And as an aside, Superman's and Shazam's powersets are very similar, lightning or no. The difference is their origins, power sources and personal philosophies.