Killing Bosses in 1 Round as Solo Leper

How these fights were made?
1. Giving Leper all necessary quirks and trinkets by editing save file (basic stats were not affected).
2. Relying on random and restarting the fight when needed.
Amount of attempts for each boss:
1. Harvest Child - 4
2. Leviathan - 30+
3. Dreaming General - 20+
4. Librarian - 20+
5. Shackles - 10+
6. Seething Sigh - 5+
7. Focused Fault - 4