| Name | Level | Stat | Type |
|---|---|---|---|
| One Punch | 85 | EVA +16 | Enemy Kills |
| One million. | - | Max HP +20 | Event |
| One on the left and one on the right. | 70 | SPD +16 | Conversations |
| One shot, one kill. | 80 | ATK +8 | Character Growth |
| One-Armed Hero | 100 | Max HP +40 | Astral Adventures |
| One-Day Hero | - | Max HP +40 | Astral Adventures |
| One-Eyed | 48 | SPD +16 | Enemy Kills |
| One-Handed | 80 | ATK +8 | Character Growth |
| One-Horned Giant | 78 | DEF +4 | Enemy Kills |
| One-eyed | 58 | CRIT +4 | Enemy Kills |
| Onigiri | 60 | ATK +8 | Enemy Kills |
| Only 1 gold. | - | DEF +2 | Event |
| Only ten dollars. | - | EVA +12 | Event |
| Only the Card Explodes First | - | ATK +8 | Event |
| Onmyoji | - | ATK +16 | Event |
| Oolong Tea | - | - | Cooking |
| Oolong Tea Authority | - | - | Cooking |
| Oolong Tea Researcher | - | - | Cooking |
| Open All Year Round | 40 | DEF +4 | Astral Adventures |
| Open-Mouthed Nonsense | 86 | ATK +8 | Hidden Quests |
| Open-minded | - | - | Fishing |
| Opening Song | 98 | DEF +4 | Enemy Kills |
| Operator | 60 | Max HP +40 | Enemy Kills |
| Operator | 80 | SPD +16 | Enemy Kills |
| Opportunist | 10 | DEF +4 | Astral Adventures |
| Opportunistic | 80 | DEF +4 | Astral Adventures |
| Opportunity Cost | 70 | Max HP +40 | Enemy Kills |
| Optimist | 75 | SPD +16 | Conversations |
| Optimist | - | - | Senshi |
| Orator | 28 | SPD +16 | Enemy Kills |
| Orchid Dream | 103 | DEF +4 | Enemy Kills |
| Order Maintenance | - | - | Senshi |
| Order a dish. | - | - | Farming |
| Orderly | - | - | Senshi |
| Ordinary | 10 | - | Astral Adventures |
| Organic | - | - | Cooking |
| Organic Chef | - | - | Cooking |
| Origin | 118 | DEF +4 | Enemy Kills |
| Origin Messenger | - | CRIT +8 | Event |
| Original | - | - | Fishing |
| Original Sinners | 108 | Max HP +40 | Enemy Kills |
| Original sinner | 85 | - | Treasure Hunter |
| Orphan | 118 | ATK +8 | Enemy Kills |
| Orphaned | 18 | ATK +8 | Conversations |
| Otaku | 55 | ATK +8 | Conversations |
| Other than that, | - | ATK +16 | Event |
| Out of control. | 80 | DEF +4 | Astral Adventures |
| Outdoor | - | - | Other |
| Outrageous | - | - | Treasure Hunter |
| Outstanding | - | - | Fishing |