This will not provide a comprehensive list of creatures and stat blocks but rather a few and a guide on how to create balanced creatures for your party, as a GM. There will be additional creatures in resource sets and pages will be subbed to this one and titled "Creatures X". X being which release of creatures.
Inspired by Attack on Titan. Credit to theoneminuteDM.
A gargantuan giant, chaotic evil named the Titan.
AC: 15
Hp 175 (13d20 + 39)
Speed 50ft.
Stat spread. STR 25 (7) DEX 10 (0) CON 17 (3) INT 5 (-3) WIS 10 (0) CHA 1 (-5)
Skills: Athletics +5
Damage Immunity to bludgeoning, piercing, and slashing from non-magical attacks
Titans have a passive perception of 12, no languages, a CR of 7, and proficiency of 3.
Thick Skin. (variant) non magical attacks excluding critical attacks deal no damage to the titans.
Grappler. The titan is so large, it can easily hold small creatures in its hands. Any creature large or smaller has disadvantage on trying to escape the titan's grapple.
ACTIONS.
Multiattack. The titan makes 2 attacks with its first or one with its foot.
Fist. Melee attack: +10 to hit, 10 ft. reach, single target (2d10 + 7 bludgeoning)
Kick. Melee attack: +10 to hit, 15 ft. reach, single target (2d6 + 7 bludgeoning). On at hit the creature must make a DC 15 strength saving throw or be pushed back 15 ft. and be knocked prone.
Stomp (recharge 5). The titan stomps the ground with one of its feet. Choose a point within 10 ft. of the Titan. Each creature within a 10 ft. radius of the strike must make a DC 15 strength save. On a failed save, a creature take 6d6 bludgeoning damage and is knocked prone. On a successful save, the damage is halved and not knocked prone.