User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-31726296-20170609230836/@comment-28209103-20170611194232

Don't forget Sheepy, she's only 12.7 cm tall but actually weight 59 kg

I know several old fairy tales with kids only around 3-7 coin height but not so for the weight.

Not so for modern one tho.. but if it's some crossover with fate then I'm sure it's magical Nanoha.. but i'm clueless of anyone with 12.7 cm from Nanoha but the system maybe refering to Blaster Magic System.. but I doubt she have Eternal Arms mastership so maybe it's Signum who mainly wield blade but she doesn't have Blaster system.. then it might not be blaster,, Catridge magic system? which Fate Testarossa also have access to.

maybe it's the intelligent device since it's small..