How would you classify a person whose behavior is unconventional and somewhat strange?

The classification of a person whose behavior is unconventional and somewhat strange as eccentric is spot on. Eccentricity refers to behaviors, habits, or attitudes that deviate from the norm but do not conform to a specific personality disorder. Individuals described as eccentric often exhibit distinctive choices or ways of expressing themselves, which can be seen as quirky or unconventional in a way that is usually non-threatening or playful. This term highlights the unique aspects of their personality, often contributing to a vibrant and interesting character without suggesting any detrimental implications.

In contrast, the other options do not capture the essence of unconventional behavior. Indifference refers to a lack of interest or concern, which does not relate to being unusual or eccentric. Meticulous describes someone who is very careful and precise, which implies a high level of attention to detail rather than unusual behavior. Plausible suggests something that seems reasonable or probable, which does not align with the idea of strangeness or unconventionality. Thus, eccentric is the most fitting term for describing someone with unconventional and somewhat strange behavior.