You should save for who you really want, this game has no pvp so just go for who you want whether it be their character, looks or skills. There's no need to feel pressured to pull for X character because they're good, hell a youtube named Just3c created a fresh account for CC and managed to clear risk 18, any further is just for bragging rights if you care about that

As for me, i'm torn between using all my originium for Nian or W, though i do occasionally throw some pulls at new banners until i hit the guarantee if said operator interests me (IE. Mostima and Nian), i rarely pull on standard banners now unless i have none of the 5 star rate up