Title says it all. The Pillar of Autumn has arrived in the Soell system with the Covenant fleet in full pursuit. Keyes has given the order to scramble everyone into full readiness, and the scene changes to the cryo bay.

Except, the cryo bay is anything but in this alternate universe; instead, the compartment's sole occupant is an individual whose origins come from an anime/manga franchise. The individual is briefed on what's happening, and now it is up to them to save the Galaxy from the Covenant and the Flood.

Round 1: The individual has access to only what was available to them in their franchise's pilot episode/book. No outside help. Nada.

Round 2: Things get more balanced. Our character has access to whatever weapons and magic were available to them at their series's midpoint.

Final Round: Our hero has full access to everything up to their franchise's most recent episode. Familiars, superweapons, and other artifacts under their control are available.