We introduce the ``Doppel teleoperation system'', which isolates several physical traits from a speaker, to investigate how personal information is conveyed to other people during conversation. With the Doppel system, one can choose for each of the communication channels to be transferred whether in its original form or in the one generated by the system. For example, the voice and body motion can be replaced by the Doppel system while the speech content is preserved. This will allow us to analyze individual effects of physical traits of the speaker and content in the speaker's speech on identification of personality. This selectivity of personal traits provides us with useful approach to investigate which information conveys our personality through conversation. To show a potential of this proposed system, we conduct an experiment to test how much the content of conversation conveys the personality of speakers to interlocutors, without any physical traits of the speakers. Preliminary results show that although interlocutors have difficulty identifying their speakers only by using conversational contents, they can recognize their acquaintances when their acquaintances are the speakers. We point out some potential physical traits to convey our personality.