Is the expression 'I welcome you' very formal? So formal as to be specifically used in some solemn rituals? At least, I've never seen it used in a daily conversation. I read this dialogue and got confused.
There's an upcoming squad tournament, Marchosias's teammates got severe injury and can't participate in it, so Elyan invited Marchosias to join his team. Marchosias accepted the invitation, and here came the dialogue.
Marchosias: I, Arthur Marchosias, hereby request to transfer into Team Crimson.
Elyan: I welcome you, Arthur Marchosias.
The dialogue seems quite formal, they even used the full name. It just sounds like some knight ritual or some holy ritual in church. A single word 'welcome' doesn't fit the atmosphere here, right?