For those who are waiting patently for the second season of One Punch Man to come around, this show will definitely fill in that hole for some ONE goodness.
Mob Psycho 100 is the brainchild of One Punch Man's creator ONE, the show definitely shows how loyal it is being even to the art style. So let's get to it. :V
The plot of the series is a rather simple one; follows the lead character Shigeo (Mob being his nickname by Reigen) who has PSI abilities and capable of seeing ghosts, espers and spirits as he has to deal with the unnatural, opposing PSI users and so on, plus having to deal with his occasional explosive moments as well. It is a very simple plot which I can stick with just for the REALLY fun and interesting cast of characters.
Now, the animation and art style... many say it is an incredible low budget and they're right. But it makes up for it by staying close to the original art style and using that budget to its advantage when it comes to really fantastic fight scenes. It was animated by BONES, the same that worked on My Hero Academia, Soul Eater, Ace Attorney: Dual Destinies' anime cutscenes and so on. This anime is also just brimming with parts that are just perfect for reaction images/gifs.
The music is pretty great as well, the OP being "99" by MOB CHOIR is very cool yet with a very strange and unique Opening sequence. I do like the Ending theme as well, "ALL OFF" by Refrain Boys which also has a fantastic ED animation as well with just using nothing but black ink, it is just fantastic to look at.
Out of all of the characters, I have to side with Reigen and Dimple being my favourite ones out of the entire batch. Mob who is voiced by Setsuo Ite, does a great job of portraying who I see as a rather younger but more emotional version of Saitama plus having his own morals to follow thanks to Reigen played by Takahiro Sakurai who is just a REALLY great and funny character, being such a con artist and trying to think up of numerous ideas to get some easy money, but also very caring too about his disciple Mob as well.
I definitely recommend this show if you're after something new from ONE, it's funny, great cast of characters, goes for some unexpected turns you wouldn't expect and while it isn't One Punch Man; it is definitely worth checking out.