Its appearance must fall within the 'theme' of the game.
I’ve seen this both on the $100 and $1,000 pledge level. Given you’re doing a fantasy MMORPG with magic, what level of technology are you stopping at? You’ve mentioned traps and piracy on your Kickstarter page so will you be including gunpowder and cannons or stopping short of those items? Is there anything your team is ruling out?
On the custom race pledge, what system do you have in place for race balancing? Certain races and creatures come with natural abilities, like spiders with webbing and scorpions with venomous stingers. Will natural abilities be balanced out with decreased stats or limits on items/magic? You’ve also mentioned a tiered system for race unlocks on your site but I forgot where. As new races are added will they be worked into that tiered system?
Will your magic system also include spells with charm/mind control elements that one could use to affect a player’s hirelings or allied/neutral creatures? Turning an enemy’s invested influence against them with magic would be an interesting way of countering influence pooling, potentially turning outmatched battles into more manageable skirmishes.
If we get ships and piracy, we'll have cannons. We have some plans for steamwork type things, so something along those lines.
On races, obviously we'll balance the races but make them awesome and unique at the same time. We can't have a race that destroys the world, but as you've seen with Slimes, we can get pretty creative. Monsters and monster abilities don't really have "stats" per se, so that's not an issue. Races, depending on the power scale and utility in the game world, will be tiered in somewhere.
On mind control - yes. We have plans to go that route. It should be interesting.