A lot of stuff is why I like him!

At first he didn't catch my eye and I pulled him (I had to check this) on the banner where Ryunon was introduced and I didn't get Ryunon. I realised way later I had a lot of light units and tried building a team for it and realised "oh Teurgis looks kinda cool. I wanna know more about him." Then I read his stories and thought he was really silly and I liked him (and also this was my first time reading anything about Qualia City so I fell in love with the setting as well).

I love his appearance (his base unit > Ryusei) and his personality and silliness. And his voice actor, Konitan, fits him so well and I fell in love with Konitan's voice as well for him. I like everything about Teurgis but definitely his looks got me first though. Everything else came after.