One of the things you might consider is how much work/effort you want to do in terms of the actual animation. Nowadays there are some very sophisticated tools which help with the process, particularly with just animating the head. If you have an iPhone at least as recent as the X (as long as it has the facial ID camera) you can buy Motion Live and Live Face from Reallusion and then automagically animate your robot head by just pointing the camera at your own face and talking. Or, if you don't have such a phone (or want to use another voice that someone provides but can't do the face) you could use the Acculips function in iClone to just type in the words and they will be matched up to the video and, again, create easy lipsync (you'd have to add some facial expression if you wanted - perhaps a robot doesn't need much).
The iPhone stuff works with both the 3D iClone and the 2D Cartoon Animator. Then you'd have to figure out how to get your robot head - it's somewhat easier to do in 3D since others have created such models you could use, but it's not impossible to do it in 2D or even to find something suitable to buy. Once you have those pieces the rest is very, very simple and RL's products are indeed the ticket to creating such a series without too much skill or effort involved.
So - to sum. If you have or could buy an iPhone with facial ID, then all you need do is look to find your robot head (either in 2D or 3D). If you find it (and we can help) then you can decide what product you need to use it. If you don't have the phone and don't want to buy it, then my advice would be to stick to 3D iClone since the Acculips function could be used to generate the lipsync you need. You still need to find the right robot head, though.
Just my two cents - others here will have other ideas.
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Mike "ex-genius" Kelley