Display to the interviewer that you are engaged in the interview process by showing off the research you have conducted on Unilever before your interview. Find out what types of qualities they consistently mention on their website.

Integrity is one of their core values and what they look for in their candidates. As stated by their CEO, "Behaving with integrity, day in and day out is non-negotiable and will help in creating a fairer and more principled world. Know the code inside out, it matters." Respect is also highly valued in their company culture. "People should be treated with dignity, honesty, and fairness. Unilever and its employees celebrate the diversity of people and respect people for who they are and what they bring. Unilever wants to foster working environments that are fair and safe, where rights are respected and everyone can achieve their full potential." External Engagement is another, "Throughout our value chain, from innovation through to our consumers, Unilever and its employees need to demonstrate the same ethical standards when engaging with others externally as when dealing with colleagues."

There is more material to draw from on their website. Do your homework and deliver an answer that showcases the breadth of research you've performed.