Från D & D 3.5e finns det Slime Child (LA + 2) Race. En modifierad version av detta verkar som ditt mest önskvärda val. Några höjdpunkter:
-2 Dexterity +4 Constitution, -4 Charisma, +2 Wisdom (could be simplified as +2 Con and Wisdom, -2 ChA)
Partial Ooze Traits: a Slime Child has many of the same traits as ooze creatures, including immunity to sleep effects, a Slime Child eats, but does not sleep and cannot wear heavy armor. But due to their human ancestry they are subject to paralysis, stunning, polymorph effects, and are subject to critical hits and flanking. They are also affected by any spell or effect that could target an Ooze.
Partial Human Traits: Slime Children are affected by all spells and affects that can target a humanoid despite being an Aberration. Its the result of a flaw in their initial creation process.
Slime Core (Ex): The slime child has a vital point and thus is vulnerable to critical hits and precision damage is extremely difficult to hit them and giving them a natural resistance to such attacks in the form of a 75% miss rate for critical hits and precision based damage such as from a sneak attack.
Favored Class: Fighter
Ett tredjepartsföretag, Alluria Publishing, gjorde Squole , en sentient Ooze PC-race (vilket skulle vara lätt att handväga som flytande). Bland annat verkar de ha blindsight 40ft. Om det är en acceptabel utbyte kanske du måste köpa sourcebook eftersom det inte är SRD-innehåll. Det finns en Reddit-recension om du vill ha lite mer information innan du investerar.