| Old-Fashioned Vampire (2 variants) | 62 |
| Old Guard (2 variants) | 16 |
| Ol' Buzzbark (2 variants) | 134 |
| Oddly Uneven (2 variants) | 15 |
| Oaken Power Suit (2 variants) | 196 |
| Numbing Jellyfish (2 variants) | 42 |
| Novellamental (2 variants) | 41c |
| Novellamental (2 variants) | 41a |
| Novellamental (2 variants) | 41b |
| Novellamental (2 variants) | 41d |
| Ninja (2 variants) | 61 |
| Neural Network (2 variants) | 195 |
| Multi-Headed (2 variants) | 117 |
| Mountain (2 variants) | 215 |
| Mother Kangaroo (2 variants) | 116 |
| More or Less (2 variants) | 40 |
| Monkey- (2 variants) | 115 |
| Modular Monstrosity (2 variants) | 155 |
| Midlife Upgrade (2 variants) | 14 |
| Mer Man (2 variants) | 39 |
| Masterful Ninja (2 variants) | 60 |
| Mary O'Kill (2 variants) | 138 |
| Mandatory Friendship Shackles (2 variants) | 194 |
| Magic Word (2 variants) | 38 |
| Mad Science Fair Project (2 variants) | 154 |
| Lobe Lobber (2 variants) | 153 |
| Lackey Recycler (2 variants) | 193 |
| Labro Bot (2 variants) | 152 |
| Krark's Other Thumb (2 variants) | 151 |
| Knight of the Widget (2 variants) | 13 |
| Knight of the Kitchen Sink (2 variants) | 12e |
| Knight of the Kitchen Sink (2 variants) | 12c |
| Knight of the Kitchen Sink (2 variants) | 12b |
| Knight of the Kitchen Sink (2 variants) | 12f |
| Knight of the Kitchen Sink (2 variants) | 12a |
| Knight of the Kitchen Sink (2 variants) | 12d |
| Kindslaver (2 variants) | 150 |
| Kindly Cognician (2 variants) | 37 |
| Just Desserts (2 variants) | 90 |
| Joyride Rigger (2 variants) | 114 |
| Jamming Device (2 variants) | 192 |
| Jackknight (2 variants) | 11 |
| It That Gets Left Hanging (2 variants) | 89 |
| Island (2 variants) | 213 |
| Insufferable Syphon (2 variants) | 191 |
| Inhumaniac (2 variants) | 59 |
| Inflation Station (2 variants) | 190 |
| Infinity Elemental (2 variants) | 88 |
| Ineffable Blessing (2 variants) | 113d |
| Ineffable Blessing (2 variants) | 113a |