Profile, Abilities and Weaknesses description is from The Transformers: More Than Meets The Eye, comic series published by Dreamwave Comics in 2003.

BIO:

If it's liquid, Splashdown is at home on it or underneath it. He's set sail and fought on it all, against everything from Decepticon marauders to the most vicious sea creatures, yet he has maintained his indomitable spirit and positive mentality throughout. Despite his gruff demeanor when shouting orders over ocean gales, Splashdown is still a jovial sort whose conviction in Autobot beliefs drives him to keep fighting no matter how grim things get. Those who fight alongside him respect his tendency to favor smart tactics over overwhelming firepower; they know SplashdaNn won't spend the lives of his soldiers carelessly. His upbeat attitude and lively speech make him a distorted mirror image of the Decepticons' Finback, whom Splashdown describes as a "filthy pirate I wouldn't mind sending to the ocean floor permanently."

WEAPONS/ABILITIES:

Subject possesses above-average strength and great intelligence as well as significant resistance to fatigue and damage. He is an experienced commander with a knack for effective tactics that minimize his troops' casualties. His outer Pretender shell is densely armored and impervious to corrosive liquids; it can withstand depths up to 30,000 feet. The shell is armed with an armor-piercing harpoon gun with a range of 5 miles and an electro-spear for hand-to-hand combat. Both are also useable in robot mode. Subject's inner robot transforms into a submersible hovercraft with a maximum above-water speed of 210 mph. In both modes, he can wield a powerful heat laser.

WEAKNESSES

[From the Datatracks of Landmine, Autobot Pretender] Splashdown's tall tales about the high seas are always fun to hear, and he's one of the best warriors we've got... but he tends to ignore the established chain of command if he thinks he knows better. His taking charge can sometimes endanger land-based operations that needed him to perform a certain function.

Bibliography of significant appearances: Besides Landmine and Cloudburst most of the Autobot Pretenders made very few appearances in the Transformers Universe.
* (Marvel) Transformers #40 - Autobot Pretenders created by Scorponok Brainstorm and Highbrow.

* Splashdown made a few non-significant appearances throughout the ~2007-08 IDW comic "-ation" series.