A few bits about this sheet. OB is "Offensive Bonus". I broke attacking into 3 categories: "M" is melee, "m" is missile combat and "M" is magical combat. The formula for rangers was M=L-1,m=L,M=L/2 (where L is the character's level).
I created a "core mechanic" before that was a blog... :) All d20 rolls were "roll under target number" rolls. "1" was a critical hit; "20" was a fumble. (Heresy!) You would get your target number by adding AC (descending) to your OB and any relevant bonus(es). It was THAC0 before there was THAC0.
Looking a Sharky, he's got a melee OB of 5, a STR of 18 (+1 to hit) and a +2 sword, Jart. If he was attacking someone in chainmail (AC 5) he'd need to roll 13 or less to hit.
"Jart" is an artifact level magical sword. It has a power pool and the various functions drain points from the pool. Much like Stormbringer, it sucks energy out of the monsters/creatures slain with the blade. The Tip is a "retributive strike" and empties the pool in one big blast attack (think The Sword and the Sorcerer)
The backside of the sheet has a wide assortment of items that Sharky would use to "swashbuckle" a bit as was his adventuring style. He also had an array of tech items that were frequently stored aboard "Dave".