Woking on this guide: It is pretty hard to collect information about this game online, so I decided to restart my old save to better fill out the following paragraphs. However, playing through it again is taking me far longer than expected.
How you can help: If you notice any errors, please tell me, and, if youre able to, provide me with a way to fact check that claim.
How i calculated "movement": 25 points of stamina translates to 1 fully stretched movement.

Steev
Starting Level: 01
Unlocked In: 1-1 "Carved in stone"
Dashes: 2
Movement: 2


Kapono
Starting Level: 05
Unlocked In: 1-8
Dashes: 1
Movement: ~2.4


Jammer
Starting Level: 11
Unlocked In: 1-B2 "The fast and the furious"
Dashes: 4
Movement: ~2.4


Ronimo
Starting Level: 14
Unlocked In: 3-4 ??? "Blackstar"
Dashes: 1
Movement: 3

Clint
Sterting Level: 01
Unlocked In: 1-4 "Thieves got your back"
Shots: 1
Movement: 2.2


Vesper
Starting Level: ??
Unlocked In: 1-9 "Lady in the water"
Shots: 1
Movement: ~3.2


Calamari Jane
Starting Level: 10
Unlocked In: 2-3 "Damsel in distress"
Shots: 1
Movement: 2.2


Cleef
Starting Level: 17
Unlocked In: 5-3 "Power up, kid"
Shots: 2
Movement: 1.6

Vahine
Starting Level: 01
Unlocked In: 1-1 "Carved in stone"
Movement: 2


Venus
Starting Level: 06?
Unlocked In: 1-13 "Golden Fingers"
Movement: 2

Sammo
Starting Level: 01
Unlocked In: 1-4 "Thieves got your back"
Stomps: 1
Movement: 2


Brad
Starting Level: 16
Unlocked In: 4-3 "Barren"
Stomps: 2
Movement: 2.6

Winnick
Starting Level: ??
Either unlocked In: "The Grandmster" or after collecting all stars More information needed
Dashes: ?
Stomps: ?
Movement: ?