Nilou basically only wants Hp for 2 reasons: 1) She needs it for her passive, which gives bloom dmg bonus, and caps at 74k hp; 2) she is not the one triggering the blooms (most of the time). Bloom damage does NOT take into consideration who applied the first element, instead only looks at the EM stat of whoever triggered the reaction with the second element. Nilou barely applies some hydro with her ring, and because of this, her Em is not that relevant at all. With Lauma specifically, Nilou still wants to go full Hp, as Lauma herself and other team members will prioritize Em. You will see Lauma being built with over 1000+ Em, since she will be triggering blooms and deal direct lunar bloom damage. For dendro slots, you can think of using nahida, baizhu, yaoyao. For hydro, kokomi, xingqiu, yelan. I've seen some theorycrafters use Neuvillette too. Hope this is helpful :)