For the Rose....
-Remove seeking shots, this character doesn't need it. Its too different from the other characters in the game and it makes her too easy in comparison to other characters
-Reduce her fire rate, it's too fast, the way it is now zombies get peppered with shots before you can even react to whats happening and for the damage she does way too powerful by comparison to other character that fire that fast
-Increase her shot speed, this will compensate for the removal of the seeking shots she has(It should be more like the sunflower in terms of shot speed)
-Damage is fine, with the chance to miss and change to fire rate, it will be perfect, for other class variants there should be a slight damage increase.. i.e. the Druid Rose, from 5 to 7
-Shot spread, she should be more effective at medium to short range, at longer range her shots should spread apart and be less effective
For the Imp....
-DON'T CHANGE THE MECH, ITS STATS ARE PERFECT DON'T TOUCH IT.. it came in way to fast in the beta and destroyed people, thats what make the imp bad, Mech rushes, but right now the mechs aren't that overpowering even in groups, but they are strong enough for what they are.
-His shots should do more damage like 5 to 6, and he should have a bit more health(to a max of 75)
other than that i think hes good, maybe a slight bit more damage redux when he does his spin attack, but its range should be double what the Super Brains spin is
He needs that glass cannon feel, and right now hes just glass, with the occasional spike here and there, which makes him nearly useless, especially since a rose (right now) can pepper him with five seeking shots and destroy him.