>>2828866For accessories I use two maxed SSR STM P-skills and one POW. The rest can be whatever STM reduction skills you can fit in (or a little extra POW). For Bromides use any STM ones that have a decent activation/reduction ratio for Nanami.
In this example clip I used two universal SR decos upgraded to SSR, but if you have/made a STM SSR+ deco to fit in the third slot that's even better (in my real build I have 3 SSR+ decos that took forever to make). I usually run through all matches with triple SSR Accessories on her, then grind replacing one with the trendy SR accessory if available. She is paired with a Momiji built to defend/Fierce Yell.