  As robots take on roles in our society, it is important that their
appearance, behaviour and personality are appropriate for the job they are
given and are perceived favourably by the people with whom they interact. Here,
we provide an extensive quantitative and qualitative study exploring robot
personality but, importantly, with respect to individual human traits. Firstly,
we show that we can accurately portray personality in a social robot, in terms
of extroversion-introversion using vocal cues and linguistic features.
Secondly, through garnering preferences and trust ratings for these different
robot personalities, we establish that, for a Robo-Barista, an extrovert robot
is preferred and trusted more than an introvert robot, regardless of the
subject's own personality. Thirdly, we find that individual attitudes and
predispositions towards robots do impact trust in the Robo-Baristas, and are
therefore important considerations in addition to robot personality, roles and
interaction context when designing any human-robot interaction study.
