Spring: day 1 onwards - Yona Iche, a mildly deppressed person with many aspirations but no motivation, her lack of specialization has left her homeless, soon prior to the cataclysm. Quite haggard and distraught by the event, she grabbed what she could and sauntered off into the wilderness and found a farm, populated by it’s own batch of zombies. She promptly took advantage of her significant build and contrarian personality to dispatch the group with relative ease, before getting her bearings on the situation.
At this point, everyone she has ever cared about may be dead, but the one glimmer of hope shined through,
She was alive, and she did not need to pay bills or hold a job. She had heard of possible medical advancements that may still exist that can prolong her life and technology that should make more concietous work of the threats she faced. However great her conceptual understanding was, she still needed to learn how to actually use all this stuff.
To this end, she made it her task to know EVERYTHING.
Jump ahead to Summer, Day 16 (31 day seasons)

Her desire to become a walking tank is only hindered by her tailoring knowledge and physical strength, at this point, as a lot of her equipment is really heavy. She really only wears this much due to life changing inspiration of a video she watched in a time long past, where these heavily armored guys beat up stuff with their shields.
Also am tempted to name the staff Leviathan, or to consider it like a wickedly spiked pillar with magical acceleration.