This is a little different than a traditional OC update, this is mainly to explain about the crossover and a few future plans I want to address with the series, not necessarily a spoiler heavy explanation. What I plan to do with this series in the future is to obviously make it something bigger especially with Super Faith and its sequel(s). Super Faith is meant to be pretty much a mash up of my other stories as well as a crossover with the Mario series and Pokémon series (particularly Pokémon Mystery Dungeon with my fan fictions mashed in) I already explained a lot about Faith the Eevee herself in the last update I actually made on this book. So I thought that explaining these two would make a little more sense.
The Pokémon Mystery Dungeon similarities obviously come from the fact that Mario and Luigi are transformed into Eevees in the Pokémon World, but as explained in the Faith the Eevee segment, they also have the Evo-switch ability. Mario and Luigi can both evolve into 3 different Eeveelutions each out of the eight which only leaves two out.
Mario can evolve into Flareon, Vaporeon and Glaceon which gives him the sins Wrath, Greed and Lust. Although Luigi seems to fit the Greediness better than Mario, they both can be greedy when it comes to gold coins. Let's be honest here. I also thought the Eeveelutions, Jolteon (obviously), Leafeon (mainly to represent Luigi's liking to plants and nature) and Umbreon (for Luigi's Mansion and Dream Team.) would better for him. Those Eeveelutions would give Luigi, the following sins: Envy, Gluttony and Sloth. Which I thought fit him the most for his sins. Gluttony could also go for both but it was also a reference to one particle Bros. Move in the Mario and Luigi games. Envy represents the jealousy Luigi has of his brother's fame and Sloth represents how Luigi likes sleeping a lot. If I'm going by certain moments in Luigi's Mansion 3 and Mario and Luigi: Dream Team.
Their move sets are actually set in stone unlike Faith's.
Mario as a Flareon has Flamethrower, Overheat, Superpower and Giga Impact. As a Vaporeon, he has the moves: Scald, Hydro Pump, Protect and Double-Edge to represent how reckless Mario can be when he attacks. As a Glaceon, he knows Ice Beam, Blizzard, Rock Smash and Strength. Mario is actually supposed to be pretty strong so I think these moves fit the best for him.
Now for Luigi, as a Jolteon, he knows Thunder (that should be a given), Charge Beam, Body Slam and Double Kick (I thought it would be a funny move for him). As an Umbreon, Flash (as a reference to the Strobulb), Dark Pulse, Throat Chop and Headbutt. A lot of his moves represent his move set in Super Smash Bros here. As a Leafeon, he can use Leaf Blade, X-Scissor, Leaf Storm and Aerial Ace. I haven't really been using the other Eeveelutions they have as much yet in Super Faith but I will be using them more frequently soon.
As for looks: They look like as you'd expect but as Eevees. Here's Eevee Mario for example:
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This art is not actually mine but this is an example of what he looks like as an Eevee and it would be similar for Luigi. I think this came from a wallpaper website but I'm not necessarily sure who actually made it.