| Infant Seagrub | 1 | 29 | 10 | — |
| Inferior Cactopod | 13 | 960 | 115 | |
| Infernal Ape | 96 | 63,445 | 1,009 | |
| Infernal Behemoth | 100 | 215,345 | 2,850 | |
| Infernal Creep | 99 | 210,456 | 2,819 | |
| Infernal Eidolon | 84 | 28,651 | 812 | |
| Infernal Gargoyle | 100 | 500,622 | — | — |
| Infernal Herculon | 103 | 281,660 | 2,917 | |
| Infernal Ladywraith | 42 | 23,302 | 934 | |
| Infernal Reverex | 59 | 66,473 | 1,428 | |
| Infernal Reverex | 150 | 131,479 | 1 | |
| Infernal Sonikbeast | 150 | 9,125,161 | 922 | — |
| Infernal Spikewing | 102 | 2,649,511 | 2,142 | |
| Infernobird Soul | 150 | 555 | 1 | — |
| Inferno Nimbustian | 150 | 47,475 | 1,466 | |
| Inferno Nimbustian Captain | 150 | 47,475 | 2,201 | — |
| Inferno of Sacrifice | 150 | 10,000 | 1,445 | |
| Inferno Skulllord | 100 | 831,396 | 836 | — |
| Inferno Sovereign | 150 | 3,083,299 | 8,750 | |
| Initiated Ashury | 150 | 7,540 | 1 | |
| Initiated Sang | 150 | 13,187 | 1 | |
| Inquisitive Poisontail | 19 | 2,299 | 166 | |
| Insatiable Lust | 109 | 272,399 | 3,209 | |
| Inscencee Scorpion | 150 | 3,888 | 1 | |
| Insect Mistress | 32 | 4,095 | 344 | |
| Insidious Towerling | 29 | 21,597 | 743 | — |
| Insidious Towerling | 30 | 22,346 | 792 | |
| Insularum: Chujong's Maid | 80 | 26,004 | 773 | — |
| Insularum: Chujong's Shadow | 80 | 31,782 | 700 | |
| Insularum: Drakolai | 91 | 11,245 | 1 | |
| Insularum: Drakolai | 101 | 178,083 | 1 | — |
| Insularum: Dreamon | 94 | 756,135 | 3,290 | — |
| Insularum: Flaming Chariot | 80 | 31,782 | 700 | — |
| Insularum: Forckolai | 92 | 392,900 | 2,829 | |
| Insularum: Forckolai | 102 | 745,170 | 3,584 | — |
| Insularum: Hammerer | 95 | 633,645 | 3,339 | — |
| Insularum: Shoveal | 92 | 589,350 | 3,227 | |
| Insularum: Shoveal | 102 | 1,987,120 | 10,731 | — |
| Insularum: Stabbin | 95 | 633,645 | 3,346 | — |
| Invading Nien Minion | 75 | 79,056 | — | — |
| Iron Falcon | 16 | 1,352 | 173 | |
| Iron Hawk | 16 | 1,352 | 173 | |
| Ironhide | 13 | 1,920 | 227 | — |
| Ironhide Grimalkin | 48 | 10,234 | 420 | — |
| Ironhide Puss | 49 | 11,481 | 427 | — |
| Ironite Demon | 98 | 54,402 | 1,029 | |
| Iron Maiden | 150 | 22,539 | 1 | |
| Ironmarrow Valiant | 23 | 2,717 | 204 | — |
| Ironshell Turtle | 150 | 26,412 | 775 | — |
| Irontail Lynxus | 11 | 857 | 96 | |