| Ruler | Kingdom | Era |
|---|---|---|
| Mr. Hannibal The Ruthless | 48 | |
| Mr. Joebob The Ruthless | Evil | 48 |
| Sir Ray The Ruthless | Fate | 44 |
| Mr. Ruthless | 47 | |
| Mr. Ruthless | 48 | |
| Mr. Ruthless | 48 | |
| Mr. Ruthless | Sleepless | 48 |
| Mr. Ruthless Gerald | 48 | |
| Mr. Ruthless II | The Federation | 48 |
| Mr. Ruthless Killer | Relentless | 48 |
| Mr. Ruthless Master | Childrens Playground | 47 |
| Mr. Ruthless Slayer | The Legion | 27 |
| Mr. Ruthless Slayer | Cease To Exist | 28 |
| Mr. Ruthless Slayer | The Legion | 28 |
| Mr. Ruthless Slayer | Cease To Exist | 29 |
| Mr. Ruthless Slayer | Music | 29 |
| Mr. Ruthless Slayer | Zeon | 30 |
| Mr. Ruthless Slayer | Canis Exercitus | 47 |
| Mr. Ruthless Slayer | Canis Exercitus | 47 |
| Mr. Ruthless Slayer | Kingdom of the Fallen | 47 |
| Mr. Ruthless Slayer | Shinobi Empire | 48 |
| Mr. Ruthlesspunisher | 48 | |
| Mr. Ruthlessslayer | 48 | |
| Mr. Seymor The Ruthless | 48 | |
| Sir Surviver The Ruthless | Carnage | 34 |