Mario? What would you roleplay? The details of you jumping into a goomba? Goddamn, i don't think it's so interesting though. But if you really work into the story and characters, mechanics.. etc. i'll maybe jump in.
Water-ones or piston. Piston = Walk into pressure plate, 2 large farms you walk in the middle of it, collecting the thingies. The water ones transport themselves by water into a common-depot, leading to another place where you will collect the thingies.
Egg: Only hatch when near level 15 Light. Being "Tamed" Only makes him not attack you, and attack hostile mobs when he leaves the lair instead. It needs 500 Of each meat to do that.
Herobrine should basically be a gamemode. You can switch your gamemode to Herobrine and it allows him to spawn in the world, if your into that kinda creepy gameplay like slender, so Herobrine mode could be like vanilla minecraft, but with a kind of slender-based scariness. Maybe Herobrine can mess with you in light levels below 5 or something. It'd be a fun gamemode to add to the game, I bet people would play on it and do letsplays so people could watch they're reactions. It seems people just like watching others scream at a computer because pixels showed up.
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CAPS LOCK ASSAULT RIFLE! WITH PURPLE BULLETS.
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Made on Einyx-SMP, Fully Vanilla Survival Mindcrack-Like Server. :3
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What do you think 'bout it, OP?
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just kidding, but, you know, WHO CARES?