I would go with Garnet because you don’t have a healer. Then I would go with Hypnos then Saoirse. I don’t have Hypnos but his special is extremely valuable. I do have Garnet and Saoirse emblemed and I use them both regularly. It really depends though on your play style and what you value in the game. If you like hitting titans Saoirse is fantastic plus she’ll make your other heroes hit harder. If you enjoy raiding Garnet’s over heal and resistance to ailments are extremely valuable and will make raiding easier. I’m eventually going to max a second Garnet. However, Hypnos is all around great. Those are the three I would focus on depending on how you enjoy the game. Whatever you decide good luck!