We have to work with two different types of characters: comic characters and game characters. A comic character has a nickname and must be able to draw speech balloons and thought balloons. The speech balloon may have another comic character as a destination.

A game character has a full name and must be able to perform the following tasks:

We will work with objects that can be both a comic character and a game character. However, we will also work with objects that are just going to be either a comic character or a game character. Neither the game character nor the comic character has a generic way of performing the previously described tasks. Thus, each object that declares itself as a comic character must define all the tasks related to speech and thought balloons. Each object that declares itself as a game character must define how to draw itself, move, and check whether it intersects with another game character.

An angry dog is a comic character that has a specific way of drawing speech and thought balloons. An angry cat is both a comic character and a game character; therefore, it defines all the tasks required by both character types.

The angry cat is a very versatile character. It can use different costumes to participate in games or comics with different names. An angry cat can also be an alien, a wizard, or a knight.

An alien has a specific number of eyes and must be able to appear and disappear.

A wizard has a spell power score and can make an alien disappear.

A knight has sword power and weight values. He can unsheathe his sword. A common task for the knight is to unsheathe his swords and point it to an alien as a target.

We can create abstract classes to represent a comic character and a game character. Then, each subclass can provide its implementation of the methods. In this case, comic characters and game characters are very different. They don't perform similar tasks that might lead to confusion and problems for multiple inheritance. Thus, we can use multiple inheritance when available to create an angry cat class that inherits from both the comic and game character. In some cases, multiple inheritance is not convenient because similar superclasses might have methods with the same name. Also, it can be extremely confusing to use multiple inheritance.

In addition, we can use multiple inheritance to combine the angry cat class with the alien, wizard, and knight. This way, we will have an angry cat alien, an angry cat wizard, and an angry cat knight. We will be able to use any angry cat alien, angry cat wizard, or angry cat knight as either a comic character or a game character.

Our goals are simple, but we may face a little problem: each programming language provides different features that allow you to code your application. C# doesn't support multiple inheritance of classes, but you can use multiple inheritance with interfaces or combine interfaces with classes. Python supports multiple inheritance of classes, but it doesn't support interfaces. JavaScript doesn't work with classes or interfaces; therefore, it doesn't make sense to try to emulate multiple inheritance in this language. Instead, we will use the best features and the most natural way of each programming language to achieve our goals.

We will use multiple inheritance of classes in Python, and we will also analyze the possibility of working with abstract base classes. We will use interfaces in C# and constructor functions and composition in JavaScript.