Where does “リア充” come from?

リア充 (Japanese) comes from Japanese リアル, from English real, from Middle English real, from Old French reel, from Latin reālis, from Latin rēs, from Latin vindicatio, from Latin vindicō — small stone, pebble; gravel, rubble.

リア充 (Japanese): a person fulfilled in real-life; normie

Definitions

a person fulfilled in real-life; normie

Ancestry of “リア充”, step by step

リア充 traces back through two separate lines of ancestry.

via Japanese リアル

Step	Language	Word	Meaning
1	Japanese	リアル	real
2	English	real	True, genuine, not merely nominal or apparent;...
3	Middle English	real	real, true, factual; concerning possessions;...
4	Old French	reel	—
5	Latin	reālis	real
6	Latin	rēs	thing, object, stuff
7	Latin	vindicatio	civil lawsuit; protection, defence; vindication;...
8	Latin	vindicō	to lay claim to as one's own (often with sibi)
9	Latin	vindex	claimant, vindicator
10	Latin	dīcō	to say, talk, speak, utter, mention
11	Latin	-tiō	tion, -ation, -ing
12	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
13	Latin	dissertus	arranged, disposed; explained
14	Latin	disserere	second-person singular future passive indicative...
15	Latin	dis-	asunder, apart, in two; reversal, removal;...
16	Latin	calceus	shoe
17	Latin	calx	limestone; chalk; the finish line
18	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via Japanese 充実

Step	Language	Word	Meaning
1	Japanese	充実	fullness, substantiality; completion, perfection;...

Every word from Ancient Greek χάλιξ →Every word from Latin -tiō →Every word from Latin dis- →