Any beast, dragon, giant, humanoid, or monstrosity can be raised as a

You can treat a group of 5 to 10 identical NPCs or other monsters as a single creature by applying the Squad template to the base creature’s stat block. This allows high-level characters to battle large numbers of enemies without bogging down the game in dozens of die rolls each turn.

Any beast, giant, humanoid, or monstrosity that has bones can be animated as a skeleton. A skeletal creature retains all its statistics except as noted below.

Type. The skeleton’s type is undead. It does not require air, sustenance, or sleep.

Ability Scores. The skeleton’s mental ability scores are reduced to the following scores (unless they are already lower): Int 6 (–2), Wis 8 (–1), Cha 5 (–3).

Skills. The skeleton loses all skills.

Any NPC can be a sahuagin. A sahuagin NPC retains all its statistics except as noted below.

Speed. The sahuagin gains a swim speed of 40 feet.

Senses. The sahuagin gains darkvision with a radius of 120 feet.

Languages. The sahuagin speaks Sahuagin.

Any NPC can be a merfolk. A merfolk NPC retains all its statistics except as noted below.

Speed. The merfolk has a Speed of 10 feet and a swim speed of 40 feet.

Senses. The merfolk gains darkvision with a radius of 30 feet.

Languages. The merfolk speaks Aquan and Common.

Amphibious. The merfolk can breathe air and water.