Board Thread:Questions and Answers/@comment-5085906-20130715091842/@comment-1504072-20130715184307

It's simpler to write it all in past tense, as using the latest chronological game as a time reference is subject to constant change, since new games are continually being released. Besides which, by the time of Metal Gear Rising (2018), is Meryl still Rat Patrol commander? Is Nastasha still a military analyst? Is Mei Ling still a Navy Captain? Maintaining past tense avoids all the problems with using present tense intermittently across the articles.

The "Metal Gear Saga" should be seen as a historical narrative while writing in-universe (even if some games are currently set in our future). However, like yourself, I have noticed present tense creeping into various article intros, so maybe other people are of a different opinion.