I have been playing Ark since betta launch and I have listed my few suggestions for TLC update on dinos below.
Titanboa - Because you cannot saddle or mount the Titanboa and with the addition of the Basilisk, the titanboa serves little to no use aside from an annoyance in the wild. It is much easier to tame Scorpions and Frogs if you are looking for a tame that provides torpor during each hit. The only plus it may have is it may be able to go through doors as its smaller? In the stock photo of the the Titanboa there is a sort of like King Cobra frill on its neck which is not present in the real version. The snake doesnt look intimidating enough.
Above and beyond the Titanboa needs some sort of ability possibly related to real snake abilities. For example, snakes are exceptionally well at picking up ground vibrations, maybe the Titanboa can have some visual tell, hissing excessively, tounges extended etc.. when walking large enemy dinos on ground are in range which would act as warning device for player or tribe and provide a viable reason enough for someone to tame them that shouldnt break the dino. Maybe give them the ability to sniff out wild eggs similar to how Troodon activation abilities work. Snakes naturally shed their skin to grow, could the Titanboa have an option to "shed skin" and gain some kind of a buff for a short duration, perhaps an "egg sniffing" ability range is increased, or maybe movement speed. Finally, what if Titanboa venom could be harvested for some sort of Narc weapon/dart and not just using its glands for boss fight.
Diplocaulus - I used this dino in beta stage in the first 3 months a long time ago and since then there has been no reason to even try and get another one. It dies in like 2 hits, only benefit is provides oxygen and chiten harvest bonus which in the grand scheme of things makes this an extremely useless dino. Back in the day its movement speed was so fast that it would pass trilobites before rendering them. In the entire time I have played this game (since pre launch) I have NEVER seen a person tame or ride one, and I am included my ally tribes I played with. It looks derpy and cartoonish, abilities are useless for end game players and almost useless for beginners as there are much better options to choose from. I would love for a reason to pick one of these guys up again but really cant find one. Maybe if it passively produced oil or something would give it more of a reason to be tamed. Maybe when you take oxygen from it gives you a buff and continues for a short time after dismounted. Maybe simply give it an underwater dash ability so can get away from enemies in a pinch using the idea of it being "skittish". Please make this guy useful again.
ARTHROPLUERA - Saw a lot of good ideas previously posted so wont spam and talk about it. Does desperately need a visual FACE lift. Body looks fine, face looks kind of cartoonish. I was staring one in the face last night when trying to tame one. Didnt look "buggie" enough. Pincers coming from the mouth should be elongated and dripping venom/spit. Antenna should move more fluidly and tend to blend into dino and become unnoticeable.
Raptor - I would love to see the Raptor get an update in mechanics but know how hard that would be for be for balancing since its considered a starter dino. The Raptor is one of the most iconic dinos that everyone knows but after a week of getting your base up the Raptors use is only good for Kibble as there are so many other viable mounts to choose from that are better like the saber, dire wolf and now the Ravager which completely puts it to shame. With the introduction of the ravager the raptor has become completely useless for aberration players. I just hate to see the most iconic dino and my personal favorite dino become completely useless. The Raptor is supposed to be stealthy and fast. Maybe once tamed it could have an ability. Maybe a larger or longer jump, speed boost with a pack or perhaps the ability to move silently? Maybe it could have some kind of mechanic like the Rhino where it can pick up speed the longer it runs.
Thanks for a great game Wild Card. Keep up the good work!