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.
Dokkan Battle Reroll Tier List
Day of Destiny Super Saiyan Gohan (Youth)
Protector of Hope Super Saiyan Gohan (Future)
[Show Off Ginyu Force] Ginyu (Goku) (Ginyu Force)
Last-Second Gambit Goku (Kaioken)