Update: As I'm no longer updating, check GameFAQs for Unit FAQ by whoami55 instead
I've managed to get all the given troops and levelled them to level 20, other than the Elephant Slug which is the 30th Daily Login reward. Having completed the game, I was no longer inclined to buy any new units from the shop... Anyway, here's a compilation of the unlockable level 20 stats and descriptions:
Name: Soldier
HP: 400
AP: 30
Mov: Normal
Prod: Very Fast
Stand. Atk: very short spread attack
Spec. Atk: normal range spread attack, grenade that travels in an arc
Name: Sandbag
HP: 2400
AP: 40
Mov: Very Fast
Prod: Slow
Stand. Atk: -
Spec. Atk: deploys sandbag
Name: Marco
HP: 640
AP: 60
Mov: Normal
Prod: Slow
Stand. Atk: normal range single attack
Spec. Atk: normal single attack
Name: Tarma
HP: 720
AP: 65
Mov: Fast
Prod: Normal
Stand. Atk: short range single attack
Spec. Atk: short range spread attack
Name: Eri
HP: 500
AP: 70
Mov: Normal
Prod: Slow
Stand. Atk: long range single attack
Spec. Atk: very long range single attack
Name: Fio
HP: 520
AP: 75
Mov: Normal
Prod: Slow
Stand. Atk: normal range single attack
Spec. Atk: long range spread attack
Name: SV-001
HP: 4000
AP: 280
Mov: Normal
Prod: Very Slow
Stand. Atk: long range single attack
Spec. Atk: long range spread attack
Name: Ostrich Slug (9th day login reward)
HP: 1200
AP: 100
Mov: Very Fast
Prod: Slow
Stand. Atk: long range single attack
Spec. Atk: long range spread attack, grenade that travels in an arc
Name: SV-Camel
HP: 1400
AP: 100
Mov: Normal
Prod: Slow
Stand. Atk: normal range single attack
Spec. Atk: normal range spread attack, grenades that travel in an arc
Name: 3-Ton Utility Truck
HP: 2000
AP: 150
Mov: Normal
Prod: Very Slow
Stand. Atk: -
Spec. Atk: Deploys Arabian Fighter
Name: DI-Cokka
HP: 1800
AP: 120
Mov: Slow
Prod: Slow
Stand. Atk: long range single attack
Spec. Atk: long range single attack
Name: NOP-03 Sarubia
HP: 7000
AP: 220
Mov: Very Slow
Prod: Very Slow
Stand. Atk: normal spread attack, bowls a canon ball
Spec. Atk: normal spread attack, bowls a few canon balls
Name: Hopper Mecha
HP: 1600
AP: 80
Mov: Normal
Prod: Slow
Stand. Atk: very short spread attack
Spec. Atk: very short spread attack, basically a kamikaze unit...
Name: Zombie Marco
HP: 3600
AP: 240
Mov: Slow
Prod: Very Slow
Stand. Atk: normal range single attack
Spec. Atk: very long range spread attack
Name: Abul Abbas
HP: 3000
AP: 150
Mov: Fast
Prod: Slow
Stand. Atk: very short spread attack
Spec. Atk: summons a 3-Ton Utility Truck but if he is surrounded by enemies, it will be better to let him continue attacking as his special will get cancelled when killed.
Name: Allen O'Neil
HP: 7000
AP: 450
Mov: Fast
Prod: Very Slow
Stand. Atk: long range single attack
Spec. Atk: very long range spread attack, however, I find the range looking quite short based on the animation on screen...
Name: Donald Morden
HP: 14000
AP: 950
Mov: Slow
Prod: Very Slow
Stand. Atk: short range spread attack
Spec. Atk: very long range spread attack, an air strike that attacks all parts of the map like a faster version of the special Metal Slug attack but will not be stop by a high health unit.
Name: Mars People
HP: 600
AP: 80
Mov: Normal
Prod: Fast
Stand. Atk: long range single attack
Spec. Atk: long range spread attack, it teleports up to the air before shooting down and landing. It is an interesting unit in that it is able to escape attacks but its projectiles fired are very slow.
Name: Elephant Slug
HP: 8000
AP: 450
Mov: Slow
Prod: Very Slow
Stand. Atk: long range single attack
Spec. Atk: very long range spread attack. Tarma rides on it and the special attack is a fireball that travels in slowly in an arc upwards.
