The following character can become LR by Dokkan Awakening. Summon rates for them are however very low, and we don't recommend you to aim to get them.
Turles Dokkan Event: Wandering Darkness of the Universe
Dokkan Battle Reroll Tier List
SS3 Goku [Golden Fist]
Raditz Story Event: The Low-Class Warrior Raditz's Pride
Spread Love! Magical Girl Fighters!
Super Battle Road: How to Survive the Hardest Game Mode