|Almost entirely inspired by Emboar bof's video, "Tobin is a bad character", found here: https://www.youtube.com/watch?v=ue20ufsm8TU
Tobin's poor offensive stats can be entirely mitigated by simply building around his defensive stats, creating a fairly... unique, but at the same time, oddly effective build.
The Wo Dao+ with a Defense refine ensures Tobin can eat up more physical hits, alongside a HP boon, while increasing the damage his Special will deal when it procs, which is incredibly important as...
With Noontime's update to a 2-charge cooldown, Steady Breath means he can activate it every time he gets attacked. This means, with the extra damage the Wo Dao gives, Noontime gives extra health back and can even net kills. Units who fail to kill Tobin instantly will also be face-to-face with a healing machine that guarantees a double. However, if running Wrath, Sol is available if you expect him to be eating constant large amounts of damage, as well as the fact the damage stacks from Wo Dao+ and Wrath, giving +20 damage when his Sol will activate.
Steady Breath is undoubtably the most important aspect of this build, granting instant access to Noontime after eating one attack from an opponent. Sol can be done the same if you get the Wrath bonus at the start of the turn, giving him even further survivability if he can eat a hit when below 75% HP. The extra Defense recieved also is important, since it lets him take on Reds like Brave Roy and Ryoma easier.
The B slot is fairly flexible, although sacking a Nephenee for Wrath 3 is a strong option, letting Sol become far easier to proc and the best way to run it, while also increasing the damage stacking with the Wo Dao's effect. This makes up for Tobin's mediocre attack almost instantly, as +20 damage is undoubtably going to at least chip away at the sturdiest Blues with Sapphire Lances.
Infantry Pulse is the C selected, since Tobin's HP should be as high as possible if possible, but anything works here - Hones, fortifies, spurs, et cetera.
Quick Riptose is a fairly strong Seal, now that it's released, making Tobin deal a bit more damage on counterattacks and dealing with Guard units easier (as he will still get his Noontime up if he gets attacked by one). Double attacking also means Sol is easier to proc. There's not much more to it than the basic 'He heals HP, and likes doubling targets due to his normally low Speed, so this works here.'
tl;dr: This set aims to make Tobin as tanky as possible in a much more creative fashion than usual, based off one of the best videos on the planet.