[@Unoedipal]

Ok, because this is a Fate RP and Fate has numbers for everything, and in Seyrun's case it might be worth it to calculate magical power output and od levels in terms of Units (if for nothing else, to better flaunt it to the other noobs), I've taken a read on circuits and magic energy stats and (assuming that C is regular, just like with Servant stats and that scales arithmetically like with Servants) I came up with this count, you can tweak it, but I think it follows canon very closely.

Quantity (of Circuits):

E: 6
D: 12
C: 25
B: 50
A: 75

Quality (x Units each Circuit can process):
E: 5
D: 10
C: 20
B: 30
A: 40

* note: I've made a mistake above but can't edit because I'm on my phone now. Stitch quantity and quality around.

Od (amount one can produce on their own)

The same as quality (A: 25).

Then again, I might have missed something, or screwed the progression, but know that I based out on official numbers for Od and Circuits quantity (25/20) of an average Joe adult magus. While the quality came from Shirou's known bad quality Circuits (10 units each). If you can fix them, do so, cause I would like to know how good Seyrun is in relation to drone else.

As a side note Rin would have about A +++++++++ Od (ridiculous 500 Units) under this count, but her output of 1000 wouldn't be that astronomically high, even with her 30 "sub circuits".