The adverb ‘else’ is only a postmodifier. It follows indefinite pronouns.
In the English Grammar Profile, A2 point 14 in the category of PRONOUNS:
indefinite pronouns with ‘else’
We did a search in iWeb corpus for:
1 SOMEONE ELSE
I would like to choose my sister as a guardian because I can’t imagine someone else.
PELIC student: French male level 3 reading class.
2 ANYTHING ELSE
If you want to become anything else, you need to have that passion or else you can not lead a good lifestyle.
TLC student: speaking test male India B1
3 ANYONE ELSE
You‘re worried that she said she told him things she couldn’t tell anyone else.
4 SOMETHING ELSE 238450
5 EVERYONE ELSE 191980
6 EVERYTHING ELSE 168788
7 NOTHING ELSE 112795
8 ONE ELSE 65656 (NO ONE)
9 SOMEBODY ELSE 35479
10 EVERYBODY ELSE 31544
11 ANYBODY ELSE 29858
12 NOBODY ELSE 22862