You're powers are 77% Mental, 83% Emotional, and 86% Physical!
|You can control the size of yourself and have limited control on other things? You can shrink down to teh size of an ant and infiltrate almost anywhere, or grow as large as a building and wrestle with giant monsters. It's not an easy power to have, but there's a lot you can do with it. You can compliment just about any team, being both the tank and the infiltrator; just not at the same time.|
If you want someone more submissive, try any of these for sidekicks: Elasticity, your own sense of spatial distortion will help them understand their powers. Invulnerability, your abilities will help them understand when it's simply not about shrugging off attacks.
If you want someone your equal, try any of these for partners: Laser Eyes, you'd be a team of precise abilities, both offensively and utility. Time Control, seriously, what's better than control over time and space?
If you want someone more dominant, try any of these for mentors: Elemental Control, their control over existing matter will help you know how to manipulate the same matter to maximum effect. Gravity Control, their control over weight will help you understand how your control of mass might work best.
Avoid Illusions, their alteration of the perception of reality only contests your alteration of reality itself.
Now I wonder if I can do individual body parts... ;)