Nice, I will let you in on a secret to Otakune Weeaboo whom has a super robotic voice (intentionally)
We used Melodyne, the original Auto-Tune to edit his raw samples. When used properly Melodyne can pitch correct both singers and instruments with minimal distortion that it would be hard to tell it was used. On the other hand, you can also pitch edit things make things sound super robotic, that auto-tune sound.
We did the latter for Otakune. Right into his very samples, we gave him perfect pitch, not only did we give him perfect pitch we took things a step further into that auto-tune territory and removed all voice modulation and crushed all the pitch drift so much that his samples no longer sound human.
He was robotically perfect in pitch, tone, and inhumanly flat delivery. Its the secret to being really clear, but he would never ever sound human after all the editing. So if you are down with editing your samples, you can use pitch correction software or plugins to make your raw samples sound robotic, though this is obviously a destructive process.
Also, some noise removal plugins that claim to "clean up" backgrounds of recordings may make you sound robotic.