I Was Thinking...
The First Shinigami (That is captain rank) May Become The Soul King At Level 900, The Soul King Gets The Boost of EVERY Squad at a Much Smaller Amount(33%), After There is a Soul King Any Shinigami lvl 800+ May Choose From 4 titles, Hot Spring Demon, Ruler Of Grain, God Of the Sword and The Great Weave Guard. The Hot Spring Demon Receives A Regeneration Rate Slightly Greater Than The Squad 4 Captain, The Ruler Of Grain Gets A Much Higher Rei(Energy Stat) And a Higher Doge Rate (33% Cannot Be Raised With Sharingan)The God Of Sword Gets A Higher Attack Rate And a Skill, God Of the Sword Control, This Skill Stuns Anyone in the Map With a Sword For 20 Seconds (CD of 15 Minutes) The Great Weave Guard Gets a Speed Boost(Max) And a 15% Evasion Rate, And Gets a Version Of Acceleration With a Smaller CD and Lasts Longer