Birthdays
Seliph: April 16
Matthew: April 9
Jaffar: August 16
Anthony: June 20-21
Clive: June 13
Mathilda: June 30 (I picked a day at random so she has the same birthday as Leo.)

Rolf wants to undiscover fetish art. He accidentally found it when looking for cool fanart of him and his friends. The fetish? Diaper fetish.

Faye is extremely good at Mario Kart and the Naruto fighting games.

Once on Halloween, Berkut wore a shirt that said Error: 404 Costume not found, and Rinea didn't find it too festive so he had to wear vampire fangs and devil horns as well.

As you can tell, Rinea loves Halloween

After he dies, Anthony becomes the Yokai Rontao and continues to look after Ariel through out the rest of the war.

Reinhardt gives out the best hugs and cuddles. Everyone goes to him when they need one.

Lukas is Asexual Aromantic (not sure if I shared this one)

Berkut once wrote a 52 page essay for his final about why Teen Titans Go is the worst show in Cartoon Network history. His teacher didn't want to read through it so he got an A for it. Everyone still believes that the teacher actually read it though.

Sigurd is afraid of fire due to a lab mishap in Middle School. Arvis still playfully jokes about it.

Alm sleeps with a plush of Celica.

Lon'qu makes really good potato salad.

I'll try to come up with more non Echoes headcanons. We haven't even scratched the surface of them.