Went via Lemoshi and Shira, Lava Tower, Arrow glacier then up the Western Breach
Some small patches of ice but no need for crampons
People say you should go up in the middle of the night though I disagree as you miss most of the fantastic views.
Helmet offers some protection against small rocks which depending upon when you go might be useful though its a personal call on that one. If with a group for sure to be safer
Bring water bottle parkas if going in the night up the breach as your exposed water bottles will freeze
Usual multiple layers also
My tip is to stay a night at the crater and explore the glaciers on top, if so you will need crampons, axe.
All in all take your time and enjoy the journey, dont rush it!
Do Mt Meru first, take the long route up first day as there is more chance of animals and the bottom loop you can go over to the ash cone also if you so planned