Kirby?

Inhale

When you take the Attack action on your turn, you can replace one of your attacks with an inhale of magical energy in a 15-foot cone that Each creature in that area must make a Strength saving throw (DC = 8 + your Constitution modifier + your proficiency bonus). On a failed save, the targeted creature is inhaled and the takes 1d10 acid/bludgeoning? damage.

Power absorption. While Kirby has a swallowed creature inside him, he earns temporary traits and actions determined by the swallowed creature’s highest ability score (minimum 12). If the creature has two or more ability scores that are tied for highest, Kirby chooses which ability score to gain traits and actions from. If the swallowed creature dies while inside Kirby, Kirby immediately loses the temporary traits and actions:

• Strength. While Kirby has a swallowed creature whose highest ability Score is Strength inside him, Kirby’s size increases to Large, he has advantage on Strength checks and Strength saving throws, and his attacks deal an additional 1d6.
  
  
• Dexterity. While Kirby has a swallowed creature whose highest ability Score is Dexterity inside him, he magically gains a +2 bonus to AC, has advantage on Dexterity checks and Dexterity saving throws, and can use his slam attack as a bonus action.
  
  
• Constitution. While Kirby has a swallowed creature whose highest ability score is Constitution inside him, he gains resistance to bludgeoning, piercing, and slashing from nonmagical weapons, has advantage on Constitution checks and Constitution saving throws, and he regains 20 hit points at the start of his turn if he has at least 1 hit point. If Kirby takes cold damage, he does not regain 20 hit points at the start of his next turn.
  
  
• Intelligence. While Kirby has a swallowed creature whose highest ability score is Intelligence inside him, he has advantage on Intelligence checks and Intelligence saving throws, and he gains the Innate Spellcasting ability.
  
  
• Wisdom. While Kirby has a swallowed creature whose highest ability score is Wisdom inside him, he has advantage on Wisdom checks and Wisdom saving throws, and he can innately cast cure wounds, requiring no material components (his innate spellcasting ability is Constitution).
  
  
• Charisma. While Kirby has a swallowed creature whose highest ability score is Charisma inside him, he has advantage on Charisma checks and Charisma saving throws, it becomes immune to charmed and frightened.

Innate Spellcasting (with a swallowed Intelligent creature inside him only). Kirby’s innate spellcasting ability is Constitution (spell save DC 15). He can innately cast the following spells, requiring no material components:

At will: mage hand
2/day each: magic missile, shield
1/day each: fireball (may be too crazy for level 3 hahah)

alt

At will: mage hand
2/day each: two level 1 spells of the creature inhaled
1/day each: one level 2 spell of the creature inhaled

On a successful save, it takes half as much bludgeoning damage and doesn't count as a use.

This damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).

You can use your Suck a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.