Kyosuke and the twins' maternal grandfather. He's a skilled psychic, his abilities also include teleportation and telekinesis. Although he's kind-hearted and affectionate, he is also somewhat mischievous and a lecher. 

Kimagure Orange Road OVA is basically the extension from the TV series. The time frame is probably in the middle of the TV series. 
Order to view with the TV series. 
White Lovers - among the episodes 35 and 45 
Hawai Suspence - among the episodes 17 and 25 
I was a cat, I was a fish - among the episodes 17 and 30 
Hurricane Akane, the shape-shifting girl - among the episodes 20 and 25 
Spring is for Idols - among the episodes 23 and 30 
Birth of a Star - Right after "Spring is for Idols" 
Unexpected Situation - after the OAV of Akane 
Message in Rouge - after the episode 48


__Non-Anime Roles:__
~!- Aku Aku in "Crash Bandicoot series" (VG) (Japanese) 
- Azaka in "Tenchi Muyo! Game-Hen" (VG) (Japanese) 
- Brain in "Animaniacs" (animated TV series) (Japanese) 
- Professor Jordan Perry in "Teenage Mutant Ninja Turtles II: The Secret of the Ooze" (live action movie) (Japanese) 
- Television in "The Brave Little Toaster" (Japanese) 
- Van Pelt in "Jumanji" (live-action movie) (Japanese)!~

Ojii-chan