Pikmin 4 Oatchi and rescuing castaways

Nintendo's store page sums up Pikmin 4 as: lead Pikmin, team up with Oatchi, and rescue castaways. Oatchi is the rescue pup who works alongside your captain, and official images show him leading Pikmin into fights and carrying the captain across water.

Pikmin 4 image: riding Oatchi across water.
Official Nintendo image: riding Oatchi across water.
ElementShown in official material
OatchiRescue pup partner
RidingThe captain riding Oatchi across water
CastawaysPeople you rescue during the expedition
Rescue CorpsThe team named in Nintendo's update news
Pikmin 4 image: the captain and Oatchi leading Red Pikmin in a dark area.
Official Nintendo image: the captain and Oatchi leading Red Pikmin in a dark area.