Leonard Bast.

Sometimes he is serious and cold, but it is just a mask.

Brown eyes like a puppy dog ​​and short brown hair styled, a little thin appearance.

A thirst for culture and self-improvement despite hardship. Leonard saves on literally everything—food, transportation—to go to concerts and read. This demonstrates his inner need for beauty and knowledge: for him, culture is not a luxury, but a necessity.
A sense of responsibility. He doesn't abandon Jackie, even though their relationship and situation bring him nothing but hardship. Even when circumstances are pressing, he doesn't shy away from the consequences and tries to act "according to his conscience."
Vulnerability and insecurity. Leonard is acutely aware of his social inferiority: he fears appearing ignorant and reacts painfully to slights. This insecurity makes him dependent on the opinions and advice of others.
Gullibility. He sincerely believes in the help of those close to him and follows their advice (for example, quitting his job), not fully understanding how fragile his situation is. It is precisely this gullibility that ultimately fails him: the good intentions of others turn into disaster for him.
Pride mingled with humiliation. He possesses a dignity that prevents him from being a mere "beggar," yet he constantly finds himself denied respect by society. This leads to internal tension and a sensitive reaction to any display of superiority.

Leonard is a lower-middle-class man, an impoverished bank clerk. He is educated, romantic, and genuinely drawn to culture and spiritual values. However, he lives with a woman with a questionable past, Jackie, which further exacerbates his social situation.