I'm not great or anything but I was also offput by Celica too since I couldn't find much data or videos on her but after playing her for awhile I realized Celica is a really fun and easy character to learn. I want to see more Celicas so if it encourages you to play her, I'll even tell you everything I know!

Her 5B is a really good poke tool and for hit confirms. 5B>5C>5D>5D>2D is probably one of the easiest high damage combos in the game(you can add 2A>5D>5D>5D at on the last 2D).

Her mixup options are pretty easy to understand too. For neutral, it should be 5B > 2B > 5C > 3C. (Mid, low, mid, low) you can choose to exclude any part of that and if they're close enough, go into 2D, 5D or 6D and start the 3 part drive combo. 2D is a low on the first two parts and the 3rd part is an overhead. It does the least damage but its a good way to keep your opponent guessing if you have pressure. Against the wall her 6A is really deceiving since it's a 2 part move that hits as an overhead and then low. If you land it you can combo it into 2A into whatever you want against the wall.

Some of her special moves can be charged, and if you land them, you can pull some pretty fun follow ups. Her Hache Rotir(236C) is a great anti air(so is her 6C, but if you whiff, it has a really slow recovery) and if you land it uncharged, you can jump cancel into an air combo. Her Marteau Flan(214B) can do the same charged if you follow up with 6B and jump cancel into an air combo.

You might already know all this or maybe not, and he might be the worst character in the game, or she might not be even close to bad but all I really care about is that if you like Celica, you should play Celica!