Personally, I wouldn't miss Echidna. It has a long summon of 10 turns and its effect, charm, while is strong if you can land it, is very hard to land successfully.
Hermes, if it's the wind one, is not too bad. First ability is extremely long at 7-turn. Second ability is too random so it is mostly moot. Third ability is decent and can potentially deal massive damage in long fights.
If you want me to doublecheck, feel free to post a screenshot of your kept gacha.