The Odder Otter Minion is also available as a reward from the following:
Silver-haloed Sack Gold-haloed Sack Material Container 4.0
The Silver and Gold-haloed Sacks are rewards from finding the Accursed Hoards in Heaven-on-High. They contain a ton of different items, but the Minion is in there. Material Container 4.0 is available from your Grand Company for 20,000 Seals. It can potentially contain any Minion from the Stormblood Expansion, including the Odder Otter and Abroader Otter. These methods are a bit indirect, though, so it’s much easier to just send your Retainers out. All of the Ventures that potentially reward the Odder Otter are 18 hours. Meaning you just get to sit back and relax while your Retainers go out and find your Minion. They all do have minimum Level requirements, starting around 60. That shouldn’t be too difficult unless you’ve really neglected them. They each cost 2 Ventures each, and are:
Fisher Tasks
Waterside Exploration XIX (Level 60) Allagan Silver Piece, Coerthan Crab, Fanged Clam, Fat Cat Minion, Gestahl Minion, Grade 1 Dissolvent, Lake Urchin, Odder Otter, Pipira Pira Waterside Exploration XX( Level 61) Allagan Silver Piece, Heather Charr, Odder Otter, Sea Pickle Waterside Exploration XXI (Level 65) Allagan Silver Piece, Koromo Octopus, Motley Beakfish, Odder Otter, Sea Lamp, Spiny Lobster, Steppe Bullfrog Waterside Exploration XXII (Level 70) Allagan Silver Piece, Axolotl Eft Minion, Curtain Pieco, Eastern Sea Pickle, Highland Perch, Koromo Octopus, Odder Otter, Sea Lamp, Spiny Lobster
Miner Tasks
Highland Exploration XIX (Level 60) Abalathian Rock Salt, Adamantite Nugget, Adamantite Ore, Allagan Silver Piece, Aurum Regis Nugget, Chrysolite, Hardsilver Nugget, Odder Otter, Red Quartz, Steel Mainspring Highland Exploration XX (Level 61) Allagan Silver Piece, Koppranickel Ore, Odder Otter, Raw Kyanite, Raw Star Spinel, Raw Triphane Highland Exploration XXI (Level 65) Allagan Silver Piece, Durium Ore, Durium Sand, Molybdenum Ore, Odder Otter, Raw Azurite, Raw Imperial Jade, Raw Rhodonite Highland Exploration XXII (Level 70) Ala Mhigan Salt Crystal, Allagan Silver Piece, Mameshiba Minion, Odder Otter, Raw Azurite, Raw Imperial Jade, Raw Kyanite, RawStar Spinel, Raw Triphane
Botanist Tasks
Woodland Exploration XIX (Level 60) Abalathian Mistletoe, Allagan Silver Piece, Cloud Banana, Dravanian Mistletoe, Floss Silk, Grade 1 Dexterity Dissolvent, Lupin Seedling, Morel Odder Otter, Porcini Woodland Exploration XX (Level 61) Allagan Silver Piece, Bamboo Shoot, Kudzu Root, Larch Log, Mountain Popoto, Odder Otter, Sugar Beet Woodland Exploration XXI (Level 65) Allagan Silver Piece, Jhammel Ginger, Odder Otter, Othardian Plum, Persimmon Log, Twincoon, Zelkova Log Woodland Exploration XXII (Level 70) Allagan Silver Piece, Hallowed Basil, Jhammel Ginger, Koala Joey Minion, Larch Log, Lotus Root, Odder Otter, Persimmon Log, Zelkova Log
Take your pick and have some patience. Eventually you’ll be rewarded with the Odder Otter Minion! And maybe even some other Minions you’re missing as well.