I have a couple:
Li Xiu - raiding in low platinum, she was a pain! Always wanted her attack all and mana control. Now I have Merlin and Proteus maxed for mana control and currently working on Joon, Vivica and Leonidas for my yellows.
Kashrek - raiding in platinum, he was always single-handedly kickng my ■■■. I raid “straght up”, no stacking for the longest time, and his heal would crush me.
Melandor - I keep reading that he’s the best 4* classic green hero, but I got him only after fully maxing Alberich and Caedmon.
*I’m still waiting on Boldtusk. Running three TC20s non-stop for a couple of months now. Just pulled Anzogh yesterday…
Which heroes came to you too late?