Whereas Commander ups players deck sizes and health totals, Lorcana simply opens up the option for attacking different opponents without any other necessary changes
Use him when your opening hand doesnt have the songs or characters you want, or later on when you need to change strategy
Some cards, like character cards, show strength, which is how much damage they can deal during a challenge, willpower, which is how much damage it takes to banish that character, or a location and lore value, the latter of which is how much lore you gain when they quest
Disney has had a lot of failures in the game space, and even though this is very different in nature from something like Disney Infinity, the outcome could have been the same
they are completely different people who just happen to be named Cid, and happen to be a machinist or technologist of some kind
They fit in the last pages of the official card portfolios