Why do many cartoons take the characters with the attribute of "fire" as the protagonist?

The fundamental reason is because of two cultural backgrounds. One is the Eastern Five Elements Theory: Jin Mu's fire, water and earth; The other is the basic elements of western alchemy: water, fire and earth. Later, the theory of five elements derived knowledge including fortune telling, such as geomantic omen and qi pulse, and alchemy derived theories of ancient western medicine (although most of them were wrong), such as the theory of body fluid. Because they tried to explain people by natural phenomena, both theories later developed the theory of linking natural elements with people's personality, such as being passionate and acting like the wind.

But cartoonists define the attribute of the protagonist as fire, which is completely a mindset. Generally speaking, the protagonist's character in Wang Dao juvenile comics needs to be cheerful, enthusiastic and reckless, which is naturally for the convenience of plot development. However, as for the fire attribute = enthusiasm, it is entirely the author's own personal preference. For example, Naruto and Sasuke are the protagonists of Naruto. The enthusiastic Naruto is the wind attribute, while the cool and extreme Sasuke is fire and thunder. So in fact, there is no necessary connection between the two, but the author's personal understanding.

One more thing, mountains, rivers, wind and rain are all unchangeable by ordinary people. Relatively speaking, fire is a natural thing that human beings can master. Therefore, in the more common spell system, fire magic is generally a category with low initial level but great aggression, which is generally very convenient for the protagonist to play. In contrast, the spells of water and earth are more difficult to control than fire, and the cost is higher, which is not suitable for novice protagonists to master at the beginning. Wind system (wind system, including thunder) is difficult for BOSS, and almost all of them can be struck by lightning.