Oolong from Dragon Ball turned into him for a short while to try and win over someone. 

Saying their name would give away the answer, though i feel the art style tells you plenty. 

Easy star. What is this guy's true form? 

Another classic anime, this one is of Ranma 1/2. I could not make a "alt form quiz" and not include him.

What is Genma's true form?

When Ichigo and Renji arrives at Oetsu Nimaiya place, there were many "girls" there. Later on Oetsu tells ichigo those were just swords. 

Those that know, you know there are quite a lot of races in this series.

What is this Bleach girl's original form? 

As i usually do, I like starting a anime quiz with something fairly easy. As putting her first is amusing when you get to the next question. 

Anime is Tsukimichi Moonlit Fantasy 

What's Tomoe's true form?

The Storm Dragon Veldora Tempest,  best buddies with isekai MC from "That time I got reincarnated as a slime". 

He's from a long-titled isekai. 

What's Veldora's original form?

This is from Bofuri. 

One of the left is called "Atrocity". It's just a transformation. What's their actual form?

Shuichi aka Kurama is a legendary spirit fox. The other choices i used were references to his powers, personality, so on. 

He's from the classic Yu Yu Hakusho shonen. 

What's Shuichi Minamino's original form? 

This anime loves to parody and reference other shows. Nyaruko's race is also called "Nyarlathotep" from Lovecraft. There's also a Cthughan and a Hasturan. 

She's from Haiyore Nyaruko san. 

What is Nyaruko original form referred to/described as?

A very cute feel-good isekai anime where the main girl just enjoys living with her growing "family". 

Slime's from Slime Taoshite 300-nen.

What's Laika's true form?

His false form resembles a plushie while His true form resembles that similar of a majestic winged Lion.

He's from Cardcaptors 

What's Kero's true form resemble most?

Way to describe this show. Imagine "Soul Eater Not" merged with "Kill La Kill". Lots of fanservice, yuri, with fight scenes and transformations. 

The anime is called Valkyrie Drive Mermaid. 

The motorcycle is the focus. What's it's normal form? 

What I think of as a unique Lamia as her tail splits apart like a flower and injects knowledge into people. 

She is from Rosario Vampire

What is sensei Kagome true form?

He's the MC from Accel World. This was his default game avatar when not inside Accel World.

Not saying the anime for a reason. 

What is Haruyuki's actual form?

Doppel copied the appearance of a fictional character in her introduction episode, though it was short and she never shapeshifted again in the anime. 

She is from monster musume.

What is this Monster girl's true form?

Precure fairies can take on various forms from transformation devices to wands, and even humans. 

She's from Suite Precure. Fairies are usually the familiars of the precures and some can have human forms.  

What's Siren's original fairy form/self?

This is the dog form of Mephisto is from Blue exorcist. A demon, and half-brother of the MC. 

If i give his name or the anime's name it will become to obvious. 

What is his actual form's race?

She's from the anime "The Scared Blacksmith". 

She is from a fantasy series, though not a Isekai. 

What is Aria's true form from a certain fantasy anime? 

She is a magic wand and a ditz that loves to tease the MC with her humanoid form. 

She called herself a demon lord when she was introduced though that was just a act. 

What is Falce's actual form in Magician's Academy? 

He is also known as the Leader of the Library Rabbit Tribe. 

He is called the Boat Hero and Book Hero, as well as another title regarding his race. 

What is ethnobalt's race from Shield Hero?

Not actually a horror anime. She was created long ago originally in order to torture. In modern day she can summon all sorts of classic torture devices. 

The anime is C3: Cube Cursed Curious. 

This girl is named Fear Kubrick, so what's her original form resemble?

Miku was born from a mixed fruit style drink can. 

Not saying the anime name as that will give it away.

She's from a battle sort of anime, what is her original form?

Cyco / Cocytus belongs to a secondary character. Her other form is that of a girl in a winter-themed outfit. 

They are from the anime Infinite Dendrogram.

The image shows the character Cocytus when merging with a mech. What's their normal/original form?

This is Hiro, one of the members of the Soma family of Fruits Basket. Each member turns into something from the Chinese zodiac. 

A lot of animals are something else in this anime. 

What is this Sheep's other form? 

Babbo is the name of it's default form. A sentient weapon that looks like a classic Kendama (sword and boy skill toy). 

The anime is called Marchen Awaken Romance. It's a classic fantasy adventure series. 

This character is called Alice. Though it is just one of many forms it takes. What is it's base default form look like?

Lizlet's true form resembles a elegant white and gold trimmed tea cup.

She is from the anime Omamori Himari

What is Lizlet L Chelsie's true form?

Hint: Only one character per series. 
Some may have rarely shown their true form, yet it was still stated in the show what their form was. 
Naturally I will use images that hide their true/original selves. 
Obviously you should not cheat by searching for names or images. 
I am only using "anime" characters only in this quiz and kept it to 25 questions. As if I included mangas too, this quiz would have been much longer.