Original Velma:

The first voice of Velma was Nicole Jaffe. She voiced  "Scooby Doo Where Are You?" as well as "The New Scooby Doo Movies." She also returned to do a couple of the videos.

She was the sarcastic, quick witted Velma, best summed up in one episode where Freddy says "Velma, you're a genius!" 
To which she replied "What else is news?"

Pat Stevens Velma:

Pat's version of Velma mellowed out quite a bit. Not quite as sharp on the attack. I think the writers and artists tended to tune their work to the way each actress voiced the character. The changes were subtle but I remember noticing. This Velma was a bit more structured, less likely to lose her glasses, more likely to make calm summaries of the situation. 

Christina Lange

I'm not sure I can do any comparison!  "A Pup Named Scooby-Doo" took things in a whole new direction. What were these kids like when they were... kids? 
The assumption was that they were always together doing the mystery thing, but what it really was, was an attempt to grab a new audience as the "trick" had worked on several other re-boots. I actually thought it was pretty funny but was sad the old gang was off the air... for the time being. 

Mindy Cohn

What's New Scooby Doo took things back toward the original formula. Mindy's Velma was kind of a cross between Nicole and Pat. The features were drawn a bit harder, but not as harsh as the newer animation. I was so glad to see them back I probably overlooked a few things. For me, the original version of Velma was back, even if she was a bit more mellow. 

Linda Cardellini

Oh boy! I can remember the anticipation waiting for this movie to come out! Ultimately, there were two of them and Linda did not disappoint! It was a big budget film so the plot had to be cranked up a bit, but I feel she was true to the character even though some questionable back-story was added. In a movie, you have to expand on the characters, but the expansion did not seem "out of character" for Velma. 

Hayley Kiyoko

Conversely, this pair of movies were low-budget flicks. However, this was no fault of Hayley, and I loved the way she played Velma! In the opening scene, she has a science fair project, which she is explaining. She is so obsessed explaining it that she completely misses the fact that she is now talking to herself! If you have not seen these two movies, rent them! They are really good, once you get past the fact that they were done on a budget! 

Mindy Again!

2010 saw the comeback of Mindy's Velma in "Scooby-Doo! Mystery Incorporated." The animation had a sharp geometric look, something that had been developing for the last few seasons. This Velma seemed a little burned out at first, but as soon as a good mystery hit, she was back to her old self!

Kate Micucci

Ah.. What? "Be Cool, Scooby-Doo!" aired starting in 2015. In all fairness, my biggest issue with this series was not Kate as much as the animation style and the way the characters were applied. This was more comic then mystery and it fell short in many departments. 26 episodes were generated but only 20 aired before the plug was pulled. 

Kate Redeemed! 

In 2019 "Scooby-Doo and Guess Who?" brought things almost full circle! The animation was far closer to the original style, as were the plots! Kate did a great job with the voice. Back in 1972, "The New Scooby-Doo Movies" brought in different guests each week. This was a return to that format. The series ran until 2021 and it was a blast seeing something so close to the original format!

Gina Rodriguez

Wow! and Wow again! This one absolutely blew me away! Gina does a great job! I wasn't sure how I would feel about the "3d" type characters, but trust me, it turned out great! The humor was off the charts, without resorting to mocking the characters. Check out the Trailer Here
Sadly, it came out in 2020 right when the pandemic hit, so it never had a chance to be shown in theaters.