sourwood
of reading
1986
Read books
there was that one where kakashi did a one handed hand stand on a kunai for a few hours and you can always have him do leaf and tree-water walking at the same time or you could stick heavier things to the body than leaves. maybe water walk on fast moving water or up a waterfall? idk visit the multiple reddits
i like how your going with the different summoning realms, since most fanfic that i've read usually just go boom show up at the perfect one for the caster of the jutsu and they just fight a bit then sign a contract. It never made sense to me since it is supposed to be quite difficult to get a summoning contract.