A tiny Decepticon protoform with: Megatron’s silver armor plating and crown-like helm shape, Shockwave’s violet core glow and single, expressive optic, an intelligence far surpassing most sparklings, though they still occasionally babble in binary.
The Sparkling has been secretly raised by Shockwave on Cybertron, but is now old enough to visit the Nemesis to “observe field operations.” That’s the official explanation. The real reason: they missed Megatron.