Hone your sk....photographic reflexes

I am still not sure which is Echos best aspect but I wanted to try her in Aggression. Being a character that wants to play lots of events Honed Techniqueis a no-brainer here especially since it looks for the printer costs so if you play them with Photographic Reflexes you still get the full bonus even if paid two resources less to play it as long as you paid with at least one mental Ressource. So playing Melee with Photographic Reflexes is 2x6 damage for 2ER. Drop Kick when you play it the second time can be either 7 damage for 2ER or 4 damage and a stun for 1ER (since you get the card draw if you pay with a physical resource).

This is more of a multiplayer deck since there is no thwart event in Echos kit but Winter Soldier and Into the Fray should be able to help here as long as there are minions around.

Spider-Girl helps since Fear no Evil brought some more minions with the vulnerable keyword and Sunfire can remove those annoying attachments.

Keep Up the Pressure & Aggressive Stance help you to get the attack events you need and Superpower Training helps you to get your American Sign Language as fast as possible to always have the mental when you need it. but also your Choreography and Echo's Katana are viable targets if you already have American sign language in play.

The Power of Aggression and Aggressive Energy also should have more than enough targets to make them viable. Helicarrier might not always make sense to use for yourself but in multiplayer you will for sure fine someone that appreciates it.