Masahiro Takenaka (竹中正洋, Takenaka Masahiro) was a former Japanese Red Army member who fled overseas.
When Rock and Revy go to deliver the documents given to them by Chang to the CIA agents on a deserted island, Takenaka pretends to be one of them and says the password Revy was told. Revy then reveals there was a secondpassword in case the front got the first one. They engage in a gun fight where Takenaka has his men fight Revy while he takes Rock to interrogate him.
When Takenaka returns to the base with Rock, Ibraha shouts at Rock and threatens to shoot him if he doesn't tell him where the documents are. Takenaka then questions Rock on many things but ends up answering Rock's own questions about himself.
Later, when Revy attacks the base with Shenhua and Leigharch, Takenaka, Ibraha and their men chase Revy and the group in vehicles. Ibraha tries to tell their men to continue their pursuit even though their forces were being picked-off by Revy and Shenhua, but is shot by Takenaka, who sees that he is emotionally compromised by the death of his son due to the American and Israeli forces. Later he appears in an airport in Japan speaking by phone about the plans for their next attack.
Takenaka is calm, personable, reasonable and doesn't often lose his cool. He is able to look at different viewpoints, which allows him to think ahead and plan. However, he also appears to be quite reckless, or it could be arrogance, in regards to himself, as he ended up answering Rock's questions about himself rather than vice versa.