My favourite character will quickly become apparent from this list lol, but Memoria first definitely for all of the Lex backstory, then Shattered/Asylum for ripping my heart out, Nemesis for being pretty much an entire episode of Clark and Lex talking about their lost friendship (as well as featuring a pretty badass Lana!) And hmm let's see, I'd also pick Lineage for the Clark and Lex backstory, and finally Hourglass for the hints of Lex and Clark's future,