Following my post about V Gundam, here's the second post where I want to talk about my favorite Gundam:
Gundam Mk-II
It's the protagonist's mobile suit from the first half of Mobile Suit Zeta Gundam, and the Gundam that gets stolen, a staple of the series.
Its performance as a Gundam is, to put it mildly, solid.
To put it less kindly, it's still under development. However, considering that it was piloted by various pilots, it's certainly a great machine.

It's not Mark II, it's Mark Two. | サイハーン・イツダヨ's Gunpla works