Ferb loves his pet platypus, Perry, very much, and their bond was at its best in "Across the 2nd Dimension", where Ferb finds out he’s Agent P, and they work together to stop 2nd Dimension Doofenshmirtz. And their goodbye before Ferb's memory is wiped is very emotional and heartwarming. He seems to have regained his memories by the series finale, as Phineas sang "🎶We meet our doppelgangers in the 2nd Dimension!🎶", and he goes along with it.
Ferb loves his sister, Candace, very much, and their bond was at its best in "Candace Against the Universe", as he and Phineas consider her the World's #1 Big Sister and claim that their summer vacation won't be fun without her, which touched her heart and she said she would have not choose better little brothers, which was very emotional and heartwarming.
He speaks in the third person, which proves that action matters more to him than just words, and it works very well.
He has great lines of dialogue, aside from usually being a silent boy.
He comforts people who feel anything but happy, namely Isabella.
He is always calm, no matter what.
His funny crush on Vanessa Doofenshmirtz.
Also, it was sweet to see in "Act Your Age", that an older Ferb and Vanessa are a couple.
Questionable character design choice, to the point where the show he originates from makes fun of him for it.
In the Phineas and Ferb: Star Wars crossover special, Darth Ferb's plan to turn his brother to the dark side was a bit overdone in the Star Wars universe, like Vader with Luke, or Kylo Ren with Rey.
While funny, his crush on Vanessa can be creepy because of big age gap between them as he is only 8 whilst she is 16, which is a bigger age gap than Clyde and Lori's, but at least his nose didn’t bleed unlike Clyde's (who’s nose bleeds eventually went away).
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