Namikawa is the Vice President of Sales. He initially encourages the Yotsuba Kira.
After receiving a telephone call from Light he ceases participation and observes the scenario.
How to Read describes him as the "most talented" of the board members who has the potential to "make it to the top" without Kira. He has a talent in shogi at the professional 4-dan level. How to Read 13 states that he detests useless subordinates.
an extended description!