Yamada is one of the antagonists of the Mobile Suit Gundam: The Origin - Amuro 0082 manga.
Yamada was a Zeon agent that was attempting to assassinate the Federation ace, Amuro Ray, with the help of Uragang, who had served under the command of M'Quve. Their attempts to cause a disturbance, however, would comically fail due to the unintended intervention of others in Amuro's travel group.
This would culminate in a replica of M'Quve's YMS-15 Gyan emerging from a park lake to attack the group, only to collapse on itself as it tried to move. The grand failure of all the schemes would eventually cause Yamada to give up as she decides to turn her cover as a tour guide into her actual job.