The following characters negate Hirudegarn's skill which reduces damage taken and deal more damage to Hirudegarn. Only SSR or above characters are listed here.
You'll get 2x Master Roshi (Santa Claus) from each multi summon. This character is used to increase Super ATK lvl 100%.
The following cards can be LR by Dokkan Awaken but the summon rate for them are not increased.
AGL UR Characters
Ferocious Counterattack Android 18
Dokkan Battle Reroll Tier List
Ultimate Awakened Power
Passion Beyond Pride Super Saiyan 2 Vegeta
Crimson Flare Super Saiyan 4 Vegeta
Eternal Horror Legendary Super Saiyan Broly