Name: Alfonse Goldstein
Age: Older than Klaus, so 25+
Gender: Male
Likes: Hot Dogs
Dislikes: Being controlled
Hobby: Observing magical plants and magical creatures
Skills: Healing plants
Nickname: Al
Roommate: Caesar Raphael
Relatives: Klaus (younger brother), Elias(youngest brother), Walter(Father), Karl (uncle), Isabel (aunt), Sigurd (cousin)

Background:
Alfonse is the first son of Walter Goldstein, and is consequently the older brother to both Klaus Goldstein and Elias Goldstein. He is an official researcher of the Ministry of Magic, and has gone on journeys with them. When they were young, Alfonse was described by Elias to be gentle and always nice to him. He and Klaus argued often, but all the same trusted and supported each other a lot, filling in where the other failed. It was also remarked that it was because they trusted each other so much that Klaus held a great amount of anger at Alfonse when he left, going as far as to make Elias wary of mentioning Alfonse's name around Klaus, and making Klaus say that Alfonse wasn't their brother anymore. He also had a previous engagement with Elaine, who was his childhood friend. While they were close enough to be best friends with each other, Alfonse admitted that their engagement was arranged by their parents. Three months before their wedding, Alfonse decided to head out on a brief journey to find Vita dragons, to further his research. He was interested in their longevity and regenerative abilities, and said that because Vita dragons only stay a month in their chosen habitat before leaving, that he had to chase a lead on their location urgently. Elaine proceeded to ask him if their wedding or his research was more important, to which he hesitated and answered that both were as important as each other. Upon hearing his answer, Elaine said that his research was more important to him, since he hesitated before answering and cancelled their engagement. She then told him that she was going to follow her own wishes like him. His abrupt decision to leave the Goldstein house and put his studies on hold without explaining his reasons to anyone resulted in the Goldsteins being angry with him, with Klaus the most noticeably angry of all.

Personality:
Alfonse is shown as a calm, easygoing, polite and caring person towards his friends, normally getting along with everyone except Klaus. As mentioned in-game, Alfonse is somewhat carefree when it comes to certain obligations since Klaus had to told him off every time there was a task with a lot of responsibility. It's shown that he gets down when Klaus gets angry at him. He loves his brothers a lot, and as such blamed himself so much for their pain when he left, that he believed himself to be undeserving of love. Despite being calm and polite it's insinuated that Alfonse could be quite dangerous as an enemy. This is shown in Hiro's route when during a reunion he falls asleep after getting drunk. Zeus, Caesar and Klaus draw his face with doodles, and after he wakes up he tells them how mean they were. He then threatens them with a revenge of his own but he does it with an evil grin which scares Caesar and Zeus. He dislikes the press and the media greatly, as they "invade people's privacy, pretending to do so for justice" and that they "love twisting the truth only to grab people's attention". This is one of the reasons why he left the Goldstein house for his research, as they had to deal with politics and the press while continuing their research. He also admitted near the end of his route that he saw his past self as having been overly optimistic and naive, and that if he had been more communicative with his brothers, then maybe they would've understood his reasons for leaving. In Klaus's main route II, it was revealed that Alfonse has a low intolerance of alcohol, such that even soft drinks with low alcohol content was enough to get him drunk. When drunk, Alfonse acted by instinct, showing his passion of some rare and dangerous plants to his friends, however, with no sense nor tact of danger, this placed them in funny yet awkward situations.
It was also mentioned that Alfonse and Klaus pulled a prank on Elias when he was really young, making Elias scared of Halloween.