Some evidences of him being autistic:
- Typical nerdy "child genius"
- Has special interests and infodumps about his tech and plane
- Hyperfixates on his projects
- Sensory things: Afraid of thunder, loves mints
- Neat freak
- Stims with his tails
- Often imitates Sonic's poses
- Has self-esteem issues
Let me know if any other signs of Austin you see in Tails! Who are your favorite autistic headcanon characters?