There are laws of Akumatization in Paris. Here are a few:
+A person can only be akumatized if they are experiencing negative emotions such as anger, jealousy, depression, etc.
+Only ONE person can feel negative emotions and be sensed by Hawkmoth at a time.
+The akumatized person must ALWAYS be related to whatever made them feel negatively in the first place.
+If any visitors coming to Paris from other places such as Marinette's grandmother, Gina Dupain, come and meet the main characters, they must be akumatized.
E.g.: Gina Dupain - Befana
Wang Cheng - Kung Food
Lila Rossi - Volpina
+The akumatized person ALWAYS has a very obvious (and almost stupid) weakness.
E.g.: Stoneheart - Very slow
Volpina - Lying too much
Befana - Can't touch her own bullets
+Ladybug and Chat Noir ALWAYS have to use their powers to stop the akumatized person.
+Akumatized persons must monologue a lot.
And those are the main laws of akumatization set down by Hawkmoth himself. All those willing to become Hawkmoth must abide by these simple laws.