From the point of view of philosophers, the person involved is a person or thing that represents another person or thing. This interpretation has a logical and rational kernel. If you understand the origin of this term, then the definition of this word by philosophers can be confirmed. Let's try to figure out where this interesting word came to us from, what meaning was put into it earlier. Ancient words are very interesting in that they can be interpreted ambiguously and sometimes completely unexpectedly.
First person involved: actor
One of the meanings of the word is a dramatic actor of roles without words, which is quite logical, if you recall the French. In French, there is such a word figurer, in translation into Russian "to depict" or "denote." A very suitable definition, isn't it? It is not without reason that actions in theatrical productions in the old days were called a "figure".
The second person involved: profession
And to the same origin can be attributed to that person involved in training dogs in attacking a person. That is, there is such a profession, the responsibility of which is to wrap yourself in a huge number of layers of clothing and protective shields and go tease the dog. In this case, the person involved is a person who portrays a hostile person to train dogs in the ability to defend their territory.
Legal person
Legal person involved - a person who is involved in a case. It does not matter in what capacity - the prosecutor, the accused or the witness. This person involved has something in common with another - public, which is discussed and analyzed. In this context, the word "defendant" is especially common in the media, law and academia (it is there that they like to discuss and analyze most of all).
Fourth person: confectioner
Another defendant exists in the confectionery business. This is a person with a special education who decorates confectionery with various figures. Creates stucco molding and figurines on cakes. This meaning comes from the Latin fingere - to invent, sculpt, touch. There is another source for the name of this profession. In the pre-Indo-European language there is the word dheigh, which means "knead the dough or clay, sculpt from dough or clay." Also a suitable definition.
The fifth person involved: ballet dancer
Have you ever seen during a ballet a group behind a soloist or dancing between soloists? The person involved is a ballet dancer performing only in group performances. This "person involved" most likely came from the Latin figura, which means "appearance, figure or image." It all fits together, right?