Trjtdtk

Below is one solution (by @Stefan) for circled numbers with the help of tikz. What can I do to make it such that I can in-place customize its draw color, fill color, text color, etc.?

documentclass[tikz,border=7pt]standalone
newcommand*circled[1]tikz[baseline=(char.base)]
 node[shape=circle,draw,inner sep=2pt] (char) #1;

begindocument
 circled1
enddocument

I would recommend using tikzmark here because this amazing library detects which mode (text vs. math mode, if math mode, which) you are in, so you won't have to care about this. And I would like to argue that one should specify the line width in relative units such that it scales with the font size. Of course, you have all the possibilities to color stuff and so on. (The best part is that you can connect the nodes in paths and so on.)

documentclassarticle
usepackagetikz
usetikzlibrarytikzmark
tikzsetmycircled/.style=circle,draw,inner sep=0.1em,line width=0.04em
begindocument
abc tikzmarknode[mycircled,draw=red]t1d 
Huge tikzmarknode[mycircled,draw=blue,text=purple]t1D
[
intlimits_tikzmarknode[mycircled,red]a1a^tikzmarknode[mycircled,blue]b1b
 f(x),mathrmdx=F(tikzmarknode[mycircled,red]a2a)-
 F(tikzmarknode[mycircled,blue]b2b)
]
begintikzpicture[overlay,remember picture]
 draw[latex-latex,red] (a1) to[bend right] (a2);
 draw[latex-latex,blue] (b1) to[bend left] (b2);
endtikzpicture
enddocument

Edit after @marmot's (kind :P) comment (thanks):

This answer REALLY takes some care about a somehow constant size for all letters but not when line width is increased/decreased, because I had to set this parameter as extra or make some hacks in the way that it will be provided to my macro and I am not really sure if the OP need to change the line width (I just gave it initally as an idea about improving the appearance.)

documentclassarticle
usepackagetikz
usetikzlibrarycalc
makeatletter
newlengthmylength
xdefCircleFactor1.1
setlengthmylengthdimexprf@size pt
newsaveboxmybox

newcommand*circled[2][draw=blue]saveboxmyboxvboxvphantomWL1/#1setlengthmylengthdimexprCircleFactordimexprhtmybox+dpmyboxrelaxrelaxtikzsetmystyle/.style=circle,#1,minimum height=mylength
tikz[baseline=(char.base)]
node[mystyle] (char) #2;
makeatother
begindocument
This answer takes care of the current font size in a way that circledi and circledW will appear the same size here and in the next paragpaph with a verb|tiny| (or whatever font).

noindent Demonstration:\
circledicircledicircledWcircledW\
circledWcircledWcircledicircledi

tiny This answer takes care of the current font size in a way that circledi and circledW will appear the same size here and in the this with a verb|tiny| (or whatever font).

noindent Demonstration:\
noindentcircledicircledicircledWcircledW\
circledWcircledWcircledicircledi

normalsize Also you can give a parameter inside an optional argument of the command and have different appearance:

circled[text=blue,fill=red,draw=black]Wcircled[fill=yellow,draw=red,text=blue]W

enddocument

This is the old answer that DOESN'T REALY take care for the size according to my answer here.

You will select the style and could add your preferred style inside the optional argument of the definition of the command (I just placed the draw=blue option)

documentclassarticle
usepackagetikz
usetikzlibrarycalc
makeatletter
defmfontsizef@size
newcommand*circled[2][draw=blue]tikzsetmystyle/.style=circle,#1,minimum height=mfontsize*1.4tikz[baseline=(char.base)]

 node[mystyle] (char) vphantomWAH1g#2;
makeatother

begindocument
This is circleda circled[text=blue,fill=orange,draw=red, line width=0.3mm]1 balloon.

enddocument

You can add more parameters to the command.

MWE:

documentclass[tikz,border=7pt]standalone
newcommand*circled[4]tikz[baseline=(char.base)]
 node[shape=circle, fill=#2, draw=#3, text=#4, inner sep=2pt] (char) #1;

begindocument
 circled1redgreenblue
enddocument

Result:

You can also specify default values for the colors using NewDocumentCommand from the xparse package:

documentclass[tikz,border=7pt]standalone
usepackagexparse
NewDocumentCommandcircleddefaults
 Oblack
 Oyellow
 Oorange
 m
 
 tikz[baseline=(char.base)]
 node[shape=circle, fill=#1, draw=#2, text=#3, inner sep=2pt] (char) #4;

newcommand*circled[4]tikz[baseline=(char.base)]
 node[shape=circle, fill=#2, draw=#3, text=#4, inner sep=2pt] (char) #1;

begindocument
 circled1redgreenblue

 circleddefaults[blue,brown]2 % two colors specified, third default

 circleddefaults3 % all defaults
enddocument

Here is a "double" customization that defines :

• an optional parameter of circled that can be any style applied to the node,


• an optional every number style that, if defined, is applied to all circled numbers.

documentclass[border=7pt]standalone
usepackagetikz
newcommand*circled[2][]tikz[baseline=(char.base)]
 node[shape=circle,draw,inner sep=2pt,#1,every number/.try] (char) #2;
tikzstyleevery number=[draw=red] % I like to use tikzstyle ;)
begindocument
 circled1circled[fill=yellow]2
enddocument

Here there is a minimal proposal hoping to have understood your request.

documentclass[tikz,border=7pt]standalone
newcommand*circled[1]tikz[baseline=(char.base)]
 node[shape=circle, fill= red, draw=yellow, inner sep=2pt] (char) #1;

begindocument
 circled1
enddocument