Deciding Pirouette's vision was the thing I had the most difficulty whilst doing this, because his magical talent lies in emotion magic, not any like element that is easily translated to Genshin, hydro was what I eventually settled on after a lot of just considering and considering, and I picked hydro because Pirouette's eyes blue, and that's really as good a reason as any to pick one for him
The apprentice gets a bow in Muriel's route, so to counter Pirouette being the hardest to pick a vision for, he was the easiest to pick a weapon for

Daphne-https://www.weasyl.com/~creamecream/submissions/1993070/doodle-geo-flower
Alverio-https://www.weasyl.com/~creamecream/submissions/1993073/doodle-dendro-peacock
Mirsa-https://www.weasyl.com/~creamecream/submissions/1993086/doodle-really-weird-looking-electro-lizard
Rinina-https://www.weasyl.com/~creamecream/submissions/1993088/doodle-pyro-fox

The Apprentice-The Arcana