Existentialism, after over a century of development, has evolved from a philosophical idea into a way of life. In recent years, a group known as "refined egoists" has emerged in both reality and animated works. The appearance of these extreme existentialists who ignore social responsibility reveals that in this era of transition between old and new ideologies, existentialist thought has awakened in people's value systems. This article intends to analyze the external manifestations of character’s existentialism in animation works to summarize the reflections of objective phenomena in reality and to discuss the contradictions and problems that the current young generation are facing between themselves and society. This article uses qualitative research methods to analyze representative characters from three animated series, The Outcast, Killer Seven, and Incarnation, and uses a thematic analysis method that combines existentialism theory to summarize the external manifestations of characters in terms of their internal conflicts, conflicts between individuals, and conflicts between individuals and society. These manifestations include the denial of determinism, affirmation of subjectivity under relative justice, identification with minority groups, denial of authority, and autonomous choice of values. Young generation people are confronted with unprecedentedly great uncertainty and insecurity brought about by the freedom of choice, as well as the social reality of the gradual awakening of existentialist consciousness in contemporary society.