Here's why:
* Consistent Personality: Throughout the play, Horatio remains a loyal, intelligent, and level-headed friend to Hamlet. He is a voice of reason and a calming presence amidst the chaos.
* Lack of Significant Change: While he witnesses the tragic events unfolding around him, Horatio doesn't undergo any major transformations in his personality, beliefs, or motivations. He doesn't experience a significant shift in his moral compass or worldview.
* Purpose as Foil: His stable personality serves as a foil to Hamlet's volatile nature, highlighting Hamlet's internal struggles and the contrast between their approaches to dealing with the situation.
However, it's important to consider a few points:
* Emotional Growth: While Horatio doesn't change dramatically, he does experience emotional growth. He grieves for his friends, becomes increasingly concerned for Hamlet's well-being, and demonstrates a growing sense of responsibility for the situation.
* Developing Wisdom: He gains wisdom throughout the play, particularly in his understanding of the events that unfold and the complexity of human nature.
Ultimately: While there's evidence of Horatio's emotional growth and developing wisdom, his core personality and values remain consistent. This makes him a largely static character in the context of *Hamlet*.