The Mandalorian is rated TV-14, with some episodes rated TV-PG. Because of these differing ratings, I suggest children under the age of 9 bypass the show. If your kid is used to Star Wars storylines and action, they'll be fine.
Naruto doesn't have Senju DNA. His arm is made of Hashirama cells but it's a biomechanical attachment. It seems to use Hashirama cells for durability only. The Uzumaki are almost as strong in the body as the Senju though, and closely related, so Boruto and Himawari might as well be Senju.
This is in most cases the strongest class of demon that can be found in Human World, as any higher class can't pass through the Keikai barrier net between the human and demon worlds. According to Koenma, Younger Toguro was an upper B-Class demon when he fought Yusuke at the Dark Tournament.
Indignation is a feeling of shock and anger when you think that something is unjust or unfair. She was filled with indignation at the conditions under which miners were forced to work.