In the third clue for @MortalMovie's reveal of the third graphic in their #ShareMortalLove celebration, we saw an ARM (a Shadowhunter arm?) with the clue: My arrows can point you in the right direction. Again, a lot of LIGHT who is someone who protects the ones he loves and has ARROWS. All signs (or arrows) still point to ALEC!
But just in case you are second guessing, here's a look at the fourth clue:
I'm a demon hunter. Clearly, I'm not scared of the dark. Who am I? #ShareMortalLove