So I'm talking to this guy I'm thinking about starting a band with, he's a guitarist and singer, and we are just talking about our gear. I told him how I have a Blackheart Little Giant, but he's never heard of it, so what should I compare it to? As in, is it like a Marshall, Fender, Vox, etc.?
You can't really compare it to anything. Why don't you just jam with him without him having to know what amp you have?

Roger Waters - 12th May!
It sounds pretty Marshall-y.
Fender American Special HSS Stratocaster
Ibanez 1987 Roadstar II Deluxe
Yamaha THR10X
Marshall JCM900 SL-X
Ibanez WD-7 Weeping Demon Wah
TC Electronic Polytune
Seymour Duncan Tweakfuzz
It's like a much bigger Pignose
Gibson Les Paul BFG Gator
Line6 James Tyler Variax JTV-69
Line6 Pod HD500
Blackheart Handsome Devil

and when you put american distortion on it, its peavyish to an extent.

Epiphone Hummingbird
Epiphone Futura Custom Prophecy (Twin EMG)
Vox Valvetronix VT20+
Vox Wah
Boss MD-2
Danelectro Cool Cat Drive
Boss EQ