I've been using Apocalypse as a board conversion for Purin; one team I would consider is
Apocalypse/Xuanzang/LFagan/Defoud/Arthur/Apocalypse
You get 2.25/9/1 stats (with Fagan's HP being more than doubled!), with 50+% (75%?) uptime on 2x RCV. Also has two kinda short-ish orb changers, and of course two board conversions that produce hearts and accelerate the team's cooldowns. Six skill boosts, five rows, five TPAs, and so forth.
Doesn't one of the Shinra Bansho cards give 2x ATK for Dragons for a turn? If you don't need Fagan's massive HP, I'd consider him. If you don't need Xuanzang's extended boost or prefer a TPA, Joan of Arc is available as well.
I think there's an appeal to having a very Norn-ish mob in both leader and active skill, except instead of trying to have dual-colors you need only focus on Dragons. Apocalypse also has the benefit of being able to run both rows and TPAs, and light being generally resisted less than RBG colors.