1)Ever since the first MG mafia.
2)I don't have a favorite alignment, as long as I do good I'm happy.
3)Doctor
4)Don't know, considering I've been vanilla for a long time now, but any ability that gives me communication with at least one partner always seems to be helpful.
5)Cause I like the game.
Anyways I'm sure everyone would love to go crazy right now and mess around like we always do, but first we have more pressing matters to attend to.
If you even read the wiki article quite frank linked to then you probably know how this is gonna go down.
There are 3 power roles that the mafia have chosen and it would be wise to speculate about their choices.
First we have the innocent child which is probably the most useless role out of the 5 choices given to the mafia. The innocent child main weakness is his vulnerability, even if we have a jail keeper(which acts like a doctor) it doesn't really detriments the mafia unless the innocent child is really good. in other words the innocent child was probably one role the mafia chose.
The second most likely role that the mafia probably chose is the tracker. The tracker is somewhat useful, if they get lucky and catch a specific mafia member on the specific night that they killed a specific target, however the tracker is useless if he doesn't aim smart and get lucky.
The third most likely role that the mafia probably chose is the jail keeper. The jail keeper can protect townies sure, but the jail keepers can also protect mafia and block any role that could be useful to the town, which is not good for the town.
The fourth most likely role the mafia chose is the 2 shot vigilante. The reason the 2 shot vigilante is likely because of how the role can act like a double edged sword. Sure it could really hurt the mafia, but they could also eliminate 2 townies as well, especially if the person given the role is reckless. However this role is less likely then the jail keeper because if the vigilante is really smart he can take out 2 mafia. Not to mention as the amount of players get smaller so do the chances that a mafia won't get hit by the vigilante.
The least likely role that would be chosen by the mafia is the one shot cop. This should be pain fully obvious why the mafia would not want this role. There is no back fire from the cop and he doesn't have to get lucky in order to retrieve information that is potentially helpful to the town.
Let's not also forget the mafia thinking of combination of the roles so that they can have an advantage. For example, by putting the jail keeper and innocent child in the game, the jail keeper is compelled to protect the innocent child since they're confirmed innocent, but that means that both the last power role and every other townie is exposed for a night kill.