No, no, no. A character *image* and *name* are trademark, when used in a trademark capacity. The fictional character itself is *absolutely* covered by copyright... the character being not just the design, but his behavior, personality, history, actions, the totality of his fictional existence. This is why one cannot take Harry Potter and just create an original story around him... that would still qualify as a derivative work, which is under copyright protection. And because the book is a series, the title "Harry Potter" qualifies for trademark protection.
In this case, it is completely relevant to look at the characters, because when taken as a whole (characters, map design, story concept, medium), it is clear this is a copy of Pac-man. We may disagree as to whether the amount of copying rises up to the level of infringement, but there is a clear copyright infringement claim to be made here. The DMCA is appropriate.