Series: Generation 1
Destroy what's below and what's above will follow.
Rumble is your basic street punk. Small, but always acting tough. Quick temper and mean disposition. Follows Megatron's orders eagerly. Transmits immense low frequency groundwaves to create powerful earthquakes. His small size limits his physical strength, but his ability to shatter the ground makes him difficult to approach in a fight.
Rumble is a small robot with lots of red (not blue, see below!) in him and looks like what he is: A small, mean little punk. Sadly he's missing the pile drivers he used so often in the G1 cartoon, but even without them he is a surprisingly posable and well-sculpted little guy for all that he turns into a simple cassette. Rumble carries two weapons on his back that double as handguns. A very good robot mode.
Rumble transforms into a small cassette that fits into Soundwave's
tape deck (or that of the Autobot Blaster for that matter). The cassette has all the necessary detailing to appear as an actual micro cassette from the eighties. Now as alternate modes go a simple square isn't that spectacular. What is, though, is how this rather intricate robot can fold himself together like that. So bottom line, good alternate mode.
The most outstanding feature about Rumble is that he often gets confused with Frenzy. The two are identical robots with different colours, but for the cartoon the colours were reversed. So Rumble is red as a toy, but blue in the cartoon, with Frenzy vice versa. As a toy Rumble is pretty nifty, though, a surprisingly posable little guy with lots of detailing and a cool look. My only complaint about him is his fragility, I fear that transforming him too often will break him sooner rather than later.