During the Celestial Age, the Strider acted as the Goo’s biologist, cataloging planetary flora and fauna without damaging the ecosystem. When the Awakening occurred, its survey equipment was evolved to a shard cannon with a projectile that can tear through the heavily armored units.
Striders are a good starting class, able to raise large numbers in a short amount of time
The Strider’s piercing shot makes it effective against armored enemies
Keeping Striders near your Mother Goo is a good way to keep her protected