Most arrow characters use a line arrowhead, which fits very well, however certain characters use triangle arrowheads which look out of place. These are the ones I found.
↰ U+21B0 UPWARDS ARROW WITH TIP LEFTWARDS
↱ U+21B1 UPWARDS ARROW WITH TIP RIGHTWARDS
↳ U+21B3 DOWNWARDS ARROW WITH TIP RIGHTWARDS
↴ U+21B4 RIGHTWARDS ARROW WITH CORNER DOWNWARDS
↵ U+21B5 DOWNWARDS ARROW WITH CORNER LEFTWARDS
↺ U+21BA ANTICLOCKWISE OPEN CIRCLE ARROW
↻ U+21BB CLOCKWISE OPEN CIRCLE ARROW
⇞ U+21DE UPWARDS ARROW WITH DOUBLE STROKE
⇟U+21DF DOWNWARDS ARROW WITH DOUBLE STROKE
⇤ U+21E4 LEFTWARDS ARROW TO BAR
⇥ U+21E5 RIGHTWARDS ARROW TO BAR
⏎ U+23CE RETURN SYMBOL
Additionally, the length of the first strokes and the heights of ↳, ↴, and ↵ do not match up with those of ↰ and ↱.
Screenshot from the website:

Most arrow characters use a line arrowhead, which fits very well, however certain characters use triangle arrowheads which look out of place. These are the ones I found.
↰ U+21B0 UPWARDS ARROW WITH TIP LEFTWARDS
↱ U+21B1 UPWARDS ARROW WITH TIP RIGHTWARDS
↳ U+21B3 DOWNWARDS ARROW WITH TIP RIGHTWARDS
↴ U+21B4 RIGHTWARDS ARROW WITH CORNER DOWNWARDS
↵ U+21B5 DOWNWARDS ARROW WITH CORNER LEFTWARDS
↺ U+21BA ANTICLOCKWISE OPEN CIRCLE ARROW
↻ U+21BB CLOCKWISE OPEN CIRCLE ARROW
⇞ U+21DE UPWARDS ARROW WITH DOUBLE STROKE
⇟U+21DF DOWNWARDS ARROW WITH DOUBLE STROKE
⇤ U+21E4 LEFTWARDS ARROW TO BAR
⇥ U+21E5 RIGHTWARDS ARROW TO BAR
⏎ U+23CE RETURN SYMBOL
Additionally, the length of the first strokes and the heights of ↳, ↴, and ↵ do not match up with those of ↰ and ↱.
Screenshot from the website:
