1) crushed by a stone (saved possibly by his heart, hashirama dna and kamui)
2) caught by amaterasu (possibly used kamui)
3) hit with 8 hundred billion paper bombs (izanagi)
4) impaled with lightning cutter (hashirama cells)
5) hit with flying thunder god slash (hashirama's cells)
6) split in half by juubi (his strong will)
7) bijuus extracted from him (juubi host is the exception)
8) forced rinne tensei (black zetsu keeping him alive)
9) gidou mazo extracted from him (black zetsu keeping him alive)
Most are explainable but...
Obito...are you a witch?
Feel free to mention any I missed as well as other characters with more lives than an ally cat.