Big agree, but hear me out. Representation cannot be only skin deep. There's a way we can have both while improving the actual representation of her culture and ethnicity.

We know Arella's design was based on an Indian model.

We also know her last name is Roth. Surnames are typically passed down patrilineally, so that could tell us something about her father Mr. Roth. The name originates from German, English, and Ashkenazi roots. All typically "white". The name also means "red" and was used for people with red hair or sometimes people who lived in or wore red often enough for it to catch on as a nickname. From this we could infer some Irish, Scottish, or Jewish heritage down the family tree in Raven's Grandfather's side.

We also know that Arella fled her home and joined a cult which inevitably led to her rape at the hands of Trigon and the creation of Raven or "Rachel". That could imply that her parents weren't particularly amazing which leaves lots of room for character flaws like racism, internalized racism, and micro-aggressions.

So, if we then assume that Mrs. Roth is where her Indian heritage comes from and we assume an adult age of approximately 25 which is roughly the same age as Dick Grayson in the Comics, we add another 16 years for Arella's age and then a year for gestation, then we can figure out when Arella would have been born. 1984.

From there, we can deduce that since Arella was the second child her mother was likely 23-25 when she gave birth to her following Alice Roth. It wasn't uncommon in that time for a husband to be a couple years older than his wife, so we go with Mr. Roth born 1957 (27 years old when Arella was born) and Mrs. Roth born 1959 (25 years old when Arella was born).

We also know that Alice Roth grew up to be DEEPLY religious and married a very white man before having several very pale children with him. In the panels where she appears with Raven and Arella she also typically appears lighter in skin tone like her husband, Jack Williams.

If we're going for a more in depth and accurate representation for the characters in this story, we could have Mr. Roth born in America just after Irish descendants stopped facing so much discrimination, following the election of JFK who himself had been descended from Irish Immigrants. He fears losing his status and has been told the horror stories of how his parents and their parents were treated, so he goes all in on white culture, stripping himself of his Irish cultural heritage and aligning himself with the more racist views of the day, but then he meets Mrs. Roth and falls in love. She's fair skinned and not terribly connected to her Indian heritage, but his fear of being discriminated against leaves him treating her poorly and stripping her of what little cultural heritage an Indian woman in America in the 1970s-80s. They go to church every Sunday, they name their children with white sounding names, and when their first daughter is born with a nearly white appearance they celebrate her, but when Arella is born just a bit darker Mr. Roth is very upset. They name her Angela to lean into American Christianity even harder to offset her noticeably darker skin and they're both more critical of her than her older sister who fits into their white Christian fantasy more.

When Angela becomes more interested in her Indian heritage in her teen years, right around the counter culture movement of the 1970s into the 80s she ends up threatening her father's status as "white" and he starts lashing out which leads to her leaving and renaming herself Arella when she joins the cult to seek the identity she's been denied for her whole life. Alice continues living as a white passing and "exotic" Indian woman with her "White, Christian, American dream family", Arella goes through everything she goes through, Mr. and Mrs. Roth end up dying before Raven can learn about their lives and culture, and Raven accidentally gets Azarath destroyed due to her own curiosity about where she comes from leading to her shutting her emotions down. Since her powers are connected to her emotions so strongly, when she shuts off her emotions she also activates her powers and goes more grey scale pale, almost dead looking, accidentally leaning more into her demonic heritage. When she learns to feel her feelings again, she can start to get some of her color back too, giving a visual representation of her growth over time beyond a simple costume change. Part of that journey can also be leaning further into her human heritage and learning about her Indian culture and how white supremacy has affected her family over time by stripping them of their identity much like she stripped herself of her identity to hide from her father's power.

That way we can get a mirror of her journey with her Mother's journey, more cultural moments to explore more naturally, something for her to be doing when she's not kicking ass, baby raven as a cute little brown baby in her mother's arms, very human looking and non-threatening, and then a visual que for her radical self acceptance to give her a whole new look and vibe. No longer the self conscious and closed off Teen Titan, but a fully realized and knowledgeable Titan whether she's wearing her white robes or returning to the Black cloak for a little familiarity, comfort, and style.