In the interest of not pigeonholing new players into the same 3 elements (especially post-ATK debuff nerf), Cthulhu, Dark Amon, Satan, or Hades are fine too. Basically, any first-tier Miracle ticket pick for a given element is fair game. For Thunder, I wouldn't start with anything less than Kirin right now.
I advise against starting with Eros since a Light team would be better off starting with Sol.