I have nothing against it. At the same time I have no idea can you use a registered trademark as a cryptocurrency abbreviation.
I know it's better to be safe than sorry with this kinda thing. But It's not my call anyway so it's really irrelevant what I think about it.

The onion is the symbol of the idea of tor network, so perhaps you're right that using it could be good but the graphic design must be fully original to Torcoin. Copying some brand and graphics is the most unprofessional thing you can do, really. "Marketing people" of the 3rd world countries do it. Torcoin in that boat, anyone?
Just saying what I've learned during my career of branding and marketing.