Ancelotti has already had an impact at Goodison Park, with the club taking 17 points from his eight games in charge.
And the 60-year-old plans to keep opponents on their toes with his tactics.
"I don't want that my team has a really clear identity," Ancelotti told the club's website.
"If you have a really clear identity, then you can play football in only one way.
"You can play football in different ways. You can play football being aggressive, defensively, with an attacking style, with counter-attack.
"You cannot say one is good and one is not good. There is no one winning system.
"I think the winning system is to put the players on the pitch comfortable.
"Our work is to put a team that has a clear idea – not clear identity – on the pitch. The players that are going on the pitch, they have to know what they do.
"And, of course, the goal is to give happiness to the supporters. This is the ambition."