The Rivulet is one of five playable Slugcats in the More Slugcats Expansion. He is incredibly agile, having the highest movement speed, swim speed, and jump height of any Slugcat, as well as greatly increased lung capacity underwater. Cycles are much shorter and shelter failures are more frequent in Rivulet's campaign.
Rivulet is unlocked as a playable character after completing the campaign as 
Hunter, 
Gourmand, or 
Artificer.
| Lung Capacity | 6.67 |
| Throwing Skill | 1 |
| Spear Damage | 1 |
| Run Speed | 1.75 |
| Pipe Speed | 1.6 |
| Pole Speed | 1.8 |
| Mass | 0.95 |
| Loudness | Standard |
| Crawling Stealth | Standard |
Rivulet is much faster than 
Survivor at 1.75x speed, also possessing increased jump height, swim speed, and a very high backflip. When running at full speed, creatures cannot grab hold of Rivulet, allowing them to easily bypass predators such as Monster Kelp and Pole Plants. Likely an unintended side effect is that this affects the climbable tendrils of proto-long legs, which are required toprogress in The Exterior.
Rivulet has a very powerful slide that is able to traverse around 2/3rds of the screen. This is ideal for traversing flat areas quickly. Jumping during the slide covers a great distance. If Rivulet slides and jumps into a wall or other solid obstacle, gaining a massive burst of momentum and fling upwards with very little directional control; this is likely unintended.
Rivulet has significantly faster swim speed and a stronger swim boost. They can also eat food underwater. Contrary to several in-game descriptions, he cannot breathe underwater and merely havegreatly increased lung capacity. Boosting depletes Rivulet's remaining air by a large portion. This can be toggled off in the Remix menu if desired.
If Rivulets holds the item 
(Bubble Fruit) for more than 2 seconds, the fuit will explote/open without the needing of water
The Rivulet requires to fill 5 food pips to hibernate and be able to pass to the next cyle, while up to 1 may be stored for the next cycle.
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Brother Long Legs are nearly absent from 
Garbage Wastes. 
Shoreline is now blue. 
Five Pebbles' superstructure is now The Rot. This altered and expanded the region, which now contains water sections with decayed pipes as well as Brother and 
Mother Long Legs with much of the area having gravity anomalies. 
The Rot has spread to 
The Exterior, with Rot cysts like the 
Daddy Long Legs being much more common. 
Shaded Citadel Memory Crypts, spreading the Rot and the native fauna into the subregion. 
Miros Birds are no longer present.
Outer Expanse inaccessible.
Rarefaction Cell from Five Pebbles, cycles return to a length similar to that of 
Monk's.