 Some reviewers expressed their disappointment at the novel 's focus on minor characters and events , with the presence of the Master Chief — the central character of the Halo series and its most iconic figure — limited to featuring in artwork and a brief appearance in the first story . On the other hand , GameTrailers praised Bungie for having the moxie to not focus on the major character . Each publication had their own opinions on the weakest story in the collection ; both IGN and GameTrailers thought that " Armor Testing " had the least emotional impact , although its surprise ending and art were well done . 
