Tiara is less outlandish but
Halo sounds more peaceful and serene. I would use
Tiara for a child and
Halo for a character. I'm reminded of the game
Halo. That's not a bad thing necessarily, but it just doesn't seem like a real name yet.
Are they alike? They are both word names but whereas
Tiana is more like spoiled princess,
Halo is an angel or an uppity goddess. Either way, the name carries inherent superiority that might be hard for the child to bear. The good news is that I don't hear the word tiara a lot, so it sounds like a word to me than it did years prior. The name is pronounced two ways, the word only one. There are more options here.
Tiara could be safe as a first name.
Halo would be much safer as a middle name. It could never be a nickname for
Haley or
Hale. That would be cool. :)
https://youtube.com/@MarioDrama632 or
https://youtube.com/@Objects_2763 :3