Isaac is Amelie's close friend in The Real World. Amelie considered Isaac as a brother because he saved her life once. They also knew each other since they were kids. 

When he is first introduced in the game, he is seen sleeping. During the Time Keeper arc, Isaac's time is stolen by Chronus and is in a deep sleep. Because 300 hours were stolen from him, he would be in a coma for at least 10 years. Once this is discovered, Amelie is determined to go to Wonderland and get Isaac's time back.

Isaac becomes a love interest in the spin-off "Lost Alice: Tales of Wonderland" which can be accessed via NTT Solmare's app Story Jar. He and Amelie get transported to Wonderland for some unknown reason. Amelie ends up playing the role of "Alice" in Wonderland, but with Isaac that is not the case. He does not play any role while staying in Wonderland, and is has a bit of a special case. 

He is more of a logical person, and is not quite able to use magic until he thinks about it from a logical perspective. Magic in Wonderland tends to be used based off of your emotions, but Isaac is more like Ace who is also able to cast magic using a logical perspective. He is also kind and dependable, just like a big brother.

Voice: I'd prefer for it to be in the medium to mid high range, but other pitches are allowed. Open to interpretation.