https://tapastic.com/series/ADBUCTED - Wonderful sci-fi themed adventure comic. The art is clean, pro and crisp and every update is just a joy to read! The characters are lovably flawed too!
https://tapastic.com/series/The-Adventures-of-Toad - The Adventures of Toad needs more subs. It attacks my nostalgia for he-man without mercy. Again, totally pro art and a unique look that it owns!
https://tapastic.com/series/Dont-Be-A-Hero Don't be a hero has already been mentioned here, but it's very much like Abducted in that it's an absolute joy to read every time an update comes along (which is weekly). And the artist is continually developing his art style which keeps getting better and better. The action is extreme and hi-octane so far!
https://tapastic.com/series/The-Pale - What to say about The Pale? It's so good that I bought it on comixology as well just to support the author. A murder mystery with astounding art, loveable characters and a suspense that is unparalleled!
https://tapastic.com/series/I-Necromancer - Tired of fantasy tropes? Then I, Necromancer is the story for you. The author describes it as a "fantasy Breaking Bad" and the first look at it's doomed protagonist/antagonist who the initial chapter delves into makes me believe that claim!
https://tapastic.com/series/i-mummy - I, Mummy is weird. Weird and wonderful. Setting: Steampunk-Victorian aristocratic society. Girl gets cursed, assasinated and wakes up as a mummy. Resolved to solve the mystery of her murder. Jane, the protagonist, is funky, fun, determined and has some special abilities now to help her on that case!
https://tapastic.com/series/Dragon-Chapel - Dragon Chapel deserves so much more attention than it gets. If you, like me, loved the old dragonball comics and the adventurous spirit of the initial run of that series then Dragon Chapel is as much for you as it is for me. Adorable protagonist Miara is also an admirably unselfish main character who's difficult not to love!
https://tapastic.com/series/ShadesOfMen-Pages - Follow the troublesome misadventures of Lev, one of a group of homlesss on the streets of Paris after they add a young man to their posse whom there might be more to than it seems. Lev is an especially intriguing and capable character who, to me, seems to really capture that saying "more than meets the eye". He's got some psychological and anger issues to work out too.
https://tapastic.com/series/My-Dad-Is-A-Magical-Girl - My Dad is a magical girl is so wonderfully quirky. And it really knows how to invoke the feels at times. It's also one of the mainstans of the StArtfaire.com anthology where you can read ahead!
I'm sure there are more that I could recommend, but all of those are great comics that everyone should give a look!